This is wonderful. The uniform may be Japanese, but the skull and the cactus colours remind me of the Mexican Day of the Dead. It's definitely my favourite palette out of all the alternatives, but it looks great in every incarnation.

These colors are so gorgeous. Wow.

Why aren't the hands bones?

That's very nice! I guess I prefere the first version in your comment, it's softer.

I did use a reference, but it's also been awhile since the last time I drew a skull before this work. If you see anything that could be improved on it, feel free to point it out. I've been staring at this piece for a bit too long that I don't know how to go about improving it. Although I think the nose and eye areas could be worked on more...

I like that skull actually its kinda what makes this special :)

I like everything I see except the skull.

It feels as if you didn't use any reference on that one, or studied the shapes... 

I rember seeing the thread. It turned out very well.

Love it!  Nice work!