Ask them to show you work they have done or are doing. You really need to see the work. Picts. LIE.
I have a couple dozen jobs that the customers expect me to be showing for reference.
Painting body panels off the bike is monkey work. Enough time, and bananas you could train a painter. It's the Prep that matters. Priming w/ an epoxy sealer is a MUST. After that you can use whatever finish you like.
I would figure a quart of sealer, a quart of paint, and a pint of reducer would give you room to spare.
Check out
http://www.finishmaster.comYou could spend the 4 hundred, and buty the tools/paint, and do it yourself. I would be happy to walk you thru from buying the right stuff to actually painting the bike.
Spraying is easy... Banana...
The prep is work.
Ps... PhotoShop is the best idea of the bunch. I have to learn that stuff.