What´s that?

I don't have any clue where to even start.

It's a caterpie sprite.

These squares are filled in:
C1, R7-R8
C14, R10-12
R1, C4
R16, C8-10.

Thanks for the hint BrockKickass3.

I was still guessing pretty much the whole time, but the hint at least gave me a starting point so I could solve it. Thank you.

Here's a not quite exact solution, but it's close enough to help.

http://kandipatterns.com/images/patterns/characters/12101_Caterpie.png.

Way too much guesswork. Without these comments, I don't think I could have gotten it. Thanks to Ekkonic for the picture and BrockKick***3 for the hints.