tsteenbergen,
Not to seem callous, but carefully. That is the best advice I can give you. Its like painting road wheels on armor. You can paint the straps very carefully by hand and patiently work right up to the edge. Any over brushing can be overpainted with the white and clean up the edge. Ant color variation will be attributed to shadow from the straps.
Another way would be to paint the straps and very carefully, right along the edge use a black wash. It will crisp the edge as capillary action will carry the thin paint along the edge. The upper edge of the strap can be dry brushed and will add an illustative quality to the edge of the strap and define it.
If you find you begin this and start making mistakes, because you are rushing it, or your hand or fingers are becoming fatigued because of the grip that people usually get when they try doing fine work, set it aside and come back to it. Plenty of time to do it right the first time than to have to go back and do a bunch of clean up.
When its finished I'm sure it would be a pleasure to see some pics of your endeavor.
Mike
Mike
"Imagination is the dye that colors our lives"
Marcus Aurellius
A good friend will come and bail you out of jail...but, a true friend will be sitting next to you saying, "Damn...that was fun!"