I like the pastel look of the colors on this one created by how the layer is semi-transparent, letting you see slightly through it in 3D. :3 Suggestions welcome? Hmmm... Well, I was looking up tutorials on acid art (I literally typed "acid art tutorial" into the search box :P) and it looks like to get that really rough grainy look of acid art, you need to put the eraser on low opacity and keep randomly erasing parts until you can barely see the layer at all, just a slight transparancy. Then you go to layers and copy the layer back and forth from one layer to another, back to the first and so on over and over and over (a lot of times) until it gets that rough look. I hope I'm explaining this well. Does that make sense?

Ugh, I don't think I explained well. Okay, so layer 1 you color on, then you erase it down to being almost all transparent, but not quite invisible. Then copy layer 1 to layer 2. Then copy layer 2 back to layer 1 and then back and forth like twenty or more times or until you see those rough edges appear.