Create Nel tu's Arrancar Mask in One Day!

Tier Haribel, Ichigo and Nel tu at Geekfest 2018

The perfectionist in me is strongly advising you that this project would be best suited if created over the course of at least a week, but it will concur that your Bleach: Nel tu Arrancar Mask can, in fact, be created in one day. 
So if you have, like me, been swapped with work and studies, so much so that you're too exhausted and demotivated to start and finish your masterpiece in time, then it is probably the best project to do on the fly.
I had actually given up on making the paper mache version of Nel's  Arrancar Mask in time for Geekfest 2018 on Saturday, the 19th May, but I was lucky enough to be given the day off that Friday; and apparently having less weight on my head and more neck mobility trumps playing Fallout 4 all day.
You will, however, need at least 12 hours or more of your time solely dedicated to crafting this project, therefore 6pm the night before your event is probably not the best time to start, unless you want to forgo sleeping and not give the mask the chance to dry and set overnight.
You might also want to have a fan heater, or a plain fan if you are not going through the winter season, ready to assist with drying your mask out faster as you build on it.
Word of warning with using heated air and copious amounts of flour paste as the combination does tend to breed bacteria, which will delay the drying time and make your project smell really weird. So use your paste sparingly if you don't have the time to rectify this problem. I, luckily, didn't encounter this problem with my mask, but it did happen with my Rayman Legends: Princess Estelia Skeletal Mace.
Should this happen to your project and you don't the time to scrape the afflicted area off your project and redo it, carefully paint over it if you can. That surprisingly stopped the bacterial growth, took the smell away and the area managed to dry out normally.

Materials Required

Sailor's Cap: bought at Hillfox China Mall for R35
Devil Horns Headband: can be bought at a China Mall, however there were none found at the Hillfox China Mall. These were given to me by a coworker.
Glue Gun and Glue
Masking Tape
Flour Paste mixed with bit of Dishwasher.
Newspaper
Cardboard
Craft Paint, Black and White
Ultimate Crafts Liquid Drops 3D Pearls - Pewter - Bought from Takealot for R29
Heat Resistant Craft Varnish

Step 1

Remove any decorations from your cap

Remove any unnecessary decorations and attachments from your cap if possible without damaging it.

Cut out 8 cardboard strips

Cut eight teeth shapes from your cardboard, the teeth will vary in size from the outer edges of the upper jaw to the its middle from small to large.
You might want to cut them slightly thinner and a tad shorter than my shapes, because I did end up removing two of the outer teeth due to my jaw line being too large in proportion to the rest of the mask.

Step 2

Glue your strips to your cap

Stick the teeth into the brim of your cap, using a glue gun.

Shape your teeth with mache

Build your teeth shape and definition by flour pasting newspaper in the central parts of your cardboard teeth.

Leave the outer rims of each tooth bare of mache.

If you can, have your fan on close by to assist with drying whenever you are not busy building onto your cap.

Step 3

Layer with mache and carve
out the eyes and nose

Coat the cap with a few layers of paper mache until you have reached your desired Arrancar mask thickness.

While wet, carve out your mask's eye sockets and nostril slits. Position any excess mache along the rims of the sockets and slits.

Even out the surface with extra layer of mache around the eyes and nose, if necessary.

Leave to dry.

Step 4

Create the horns from two
newspaper rolls

Remove the horn tips from your devil horn headband.

Using masking tape, create two newspaper rolls.

Take one roll and cut it down to your desired horn size.

Snip off the corner of one end.

Tape your horn tip onto the other end (the unsnipped end) of your roll.

Curve the roll into the shape of a ram horn and tape where necessary to keep the horn's shape.

Repeat with the second roll.

Step 5

Paste the horns to your mask

You will only want continue with this step when the sides of your mask has dried and hardened enough or else your mache layers will begin to separate from the cap as you stick the horns to them.

Layer the horns with mache

Starting with the top part of your horn, glue it down along the sides of your mask.
Slip your finger into the snipped end to assist in setting the horn in place as the glue dries.

Layer and build on the horns with mache.

Leave to dry.

Step 6

Create the ridges along
the horns

Using your 3D paint, create the circular ridges along the length of both horns.

Leave to dry.

Step 7

Paint your mask

Paint your eyes and nose

Using your Black Craft Paint, paint the eye sockets and nostril slits.

Leave to dry.

Using your White Craft Paint, paint the entire mask.

Leave to dry.

Step 8

Finally, coat your mask with Heat Resistant Craft Varnish.

Leave to dry and then apply a second layer of varnish.

Leave overnight to dry.

Now don, go out into the world and find your Nnoitra Gilga to irk with life lessons!

Coat with craft varnish

You can find out what my budget breakdown for my Nel tu Cosplay and how to create Gamzuza, her Zanpukuto by clicking the relevant links as well.