Wow, i just got back and saw your comments, I really appreciate them

feyincognito > about the yellow highlights, i tried to make some "reflecting light" (don't know if it's the right english term?), though it may be too light since it's only 4 colours indeed.

Thanks a lot, i'll work hard and improve for my next pixel art

 The smile definitely needs work; right now it seems like random lines of yellow and dark blue (almost like the mouth was re-sized incorrectly) along the shape of the purple area behind them. I also don't quite understand the yellow highlights underneath the dark blue on both side of the Ditto.

 Agreed with everybody else on the colors, Partack also has a valid point with the 'cuteness', it is a bit lacking.

 Great colours as everyone has stated, however one thing bugs me about this piece and forgive me in advance as this is subject to ones own opinion, but as ditto is one of my favourite pokemon, I just had to say that I didn't think your version of it was very cute. particularly the face. As simplistic as two dots and a line are, the way those lines are shaped make the difference from 'smily face' to 'CUTE smily face' (also this).  The blobs/shadows and highlighting are great though and it definitey looks like a ditto so good job regardless.

 Good job! I like the colors.

 I like the pallate of this alot.

Good job.

very nice colors!! they suit it well