first of all hav u painted a guitar before???????
if your interested in learning to paint w/ spray cans, buy books at this website. www.paintyourownguitar.com.
that paint job will probably b hard to do, not a beginner paint job, it really detailed for spray cans.
for the stars if u use the speckle brush idea it wont be consistent and u will get a lot more stars than the angel design u did has.
sorry i didnt read your whole post but it was REALLY lONG!!!!!!!! so i think u were talking about clear. if you want to use spray can clear which would b good to do if your doing the design w/ spray cans, you will need about 35 coats of clear, mayb 3 cans worth, and i know thats a lot, but when u wetsand it, u will need a lot of clear on top to level out the ridges in the paint or u will just sand right into the design u put a lot of hard work into. also with spray cans u need to let the 35ish coats of clear set for about 2 months, more would b better, but thats how long it takes to get the wood to absorb the clear and hav it b suitable to wetsand.