Looks pretty good! One tip though: if you don't plan on adding more Fiberglass to this piece, I think you should do another coat of resin to cover all of those not covered bits of fiberglass. Otherwise, they might fall out and you don't want to have fiberglass everywere. Or they might poke into your arm and that is very itchy. For painting, I think it doesn't really matter too much if you do it now or later as long as you know what color you want and you know you can get more of that exact same color. If you do change your mind about the color, you can always repaint.