I like the preview colors more as well. I think the dithering is good in some places but not as good in others. The big squares that are in the dithering pattern in a few places are very noticable and distracting in my opinion. I get what you were going for, and the technique is cool, but I think it looks best when you stick to smaller or at least more rounded shapes.

What did you think it was? Toad's head in the universe, you would never guess if I didn't told you so hehe..
About the colours, it's just a taste thing. There are many other colour shemes for this particular piece but I like the red to deep purple the most, so I put it here. I've used this dithering technique before, but now I made it a lil' bit more complicated (before I just used squares and dots).
Anyways there is a lot work this needs but will not get, I have many more ideas for pix art, this seems like a waste of time. I'll keep it comin' soon.

 Ohhh!!! I've been looking at the preview for a few minutes now and didn't realise at all that it was a frog haha I think I prefer the preview colours a lot more though... I really was attracted to the square textured dithering c: