After a few years of doing these, I've found a few more tricks to getting these to come out nicely, so I've redone my old acrylic eye tutorial. wolfbird will be commenting with some tips/tricks for resin domes, I personally have never used them so I cannot say much on the subject.
As always, ask questions if I was unclear or if you need more information!
Link
Twizler
Ohhhh ok, cool. I was trying to paint the back of the glass domes and it wasn't working to well... ill try this