How do you enter it into the challenge?

very nicely done!  The shading and proportions are excellent!  You should make one for the challenge

nice! :)

This image has 15 colors including transparency.

Lordofsax was suggesting that English is not Mutley's first language.

English is my first language.

I don't think that was intentional, I don't think English is their first language. You've also got a great penguin and really nice detail, especially for the size.

First of all, I am a girl, second, I used 6.

Oh, i don't know it..But how much colors he used?

That's because this doesn't folow challenge guidelines.

The more realistic than others...