Personally, I'd
build an
armature of
Lath, Rattan or similar. I'd probably use EPS or Bead foam attached to the
armature. this will require
fitting the blocks used just like stone work. Good job for the Minecraft Kids. Once you have enough layers built up start your actual sculpting. Finish by sanding everything, you'll be amazed at what a smooth finish you can get from Bead foam. Then
base/seal with
Shellac, or even better "Killz".
EVA is great for Mask making, and cosplay prop making buy it is EXTREMELY expensive for building a prop of this size. it also would require some pretty extensive patternmaking skills to develop the results seen above. Also, the depths of the craving require for the above are going to require a much thicker foam than 2mm. 20mm Maybe. If you've never done
Pattern making for Masks or
props it's a very extensive process that often times requires you to make a full sized mock-up in the first place. It's possible, if you have the right software to develop a
pattern in software then
plot out the patterns in full-size. but again it takes quite a
bit of skill and a LOT of
fitting, trimming, refitting, trimming too much, starting over, getting mad.... There are a lot of really talented
Props makers here, so someone may come along and tell you a different way.