I have but never considered taking pictures at the time and sold the bike several years ago. I did it because previous owner had used alkaline alum cleaner and ruined the silver finish on the motor. I sprayed with a small Air Brush and equally small compressor and used normal automotive paint that I just matched to engine color with chips.
All the work is prep, degreasing, sanding, washing it, taping off the surrounding area, removing ALL bolts you can and taping the remainder with 3M Fineline etc. Tape work will either make it look like original or it will have overspray and ragged tape lines that will look so bad. Just alot of work but very satisfying when done.
I recently saw a SEEG that had been sprayed with Rattle Can High Temp Brake Caliper paint from Amazon and it looked very good but the guy had done his prep work. Per him total cost was less than a $100 and he had never sprayed before but did practice.
If you had to pay someone to do it with the motor in the bike, cost would be prohibitive, I probably had 48 hours total in one I did, someone professional would take less but even 40 hours would be couple thousand dollars just in Labor.