That looks VERY cool, NICE JOB!!!!
Fair price to me would depend on how you did it. If you surface prep, use enamel/hardener, then some type of top coat to seal and take off the sheen, then $40 is probably not too bad. If you just rub a crayon over and then clean off the surrounding area, then maybe $2.
-Randy
I say charge $50 for most basic colors, extra $5 for off the wall colors....Just so long as mine is done for material.
It looks cool, but I don't think you realized that you did it in the colors of the Mexican flag
or the Italian flag...