This awesome picture very good. Oh, and dont worry about "great artists" mocking you. Doing so would probably just give them a bad rep anyways.

This is actually pretty good. It's a very abstract piece, and I also like the white background, which make the colors stand out. I think you should have added a little more of the color of your objects to the anti aliasing. Other than that, great job.

yeah I know it isn't the best i could have done, but it's my first dithering ever and as you realized my AA sucks . as for the contrast it was kind of done in purpose. I wanted to keep it simple and with the less colors possible ^^.

I'll edit the peace for the square (which you should have said was horrible and ruined the picture lol)

the absence of highlite is also on purpose (I really like the look it gets without any ^^

the tongue is grey -well...- because it isn't pink xD

Thanks for the poste though, I always love critics

Very good for a first! Cool idea, nice colors.

I think it needs more contrast, or some way to make the slug more redable among the other stuff.

Your antialiasing can improve a lot: it won't work with a single grey midtone for all colors.

Some shapes could be cleaner (cube at lower right). Dithering is not needed, but some highlights in the slug and shapes might be useful.

And why a grey tongue?