It's a dangerous thing to do by your self on a good instrument!('cause i think it's not your trade) That's a meticulous trade!
I did it several years ago. I've painted Martin Luter King on my first (bad) guitar. The (spray) drawing was cool but...
I didn't pull off the polish... when i was playing and so , touching the body of the guitar with my hands or with sleeves it was like glue! bad sensation!
If you want to do that correctly you'll have to pumice all the body! paint wathever you like and then, put a polish coat... It's a very long and difficult work!
About the flammes ask to Jimmy Hendrix!
Courage if you try it!
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KWA KWA KWA KWA KWA KWA KWA KWA