I do it all the time. Either to try to correct a transfer that's sitting funny on a marine soulderpad, or to embellish the iconography, or what have you.
Paint over it first with a thin layer of Lahmian medium, then do what you've gotta on top of it. A very fine brush, and paint that is leaning towards the thin side, without being too thin gives the best results (thin it with lahmian medium, a little at a time). brace both hands on the edge of your bench and go slow. freshen the paint on your brush often and give it a test stroke to take off the initial excess, spinning the point as you do to bring it to a nice tight spiral. If you're doing yellow over black you may want to put down white first.
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