These are all recessed castings, thankfully, so we can pretty easily restore the paint. Here's what I do….
(Below) Using automotive touchup paint from Dupli-Color with the fine pen feature, I fill the recesses with paint, then immediately wipe the excess with a tight-weave cloth lightly soaked in acetone or similar. I wrap the cloth tightly around a finger, turning to a clean area with each wipe so as not to redeposit the wiped paint. One or two wipes is all that's necessary. I repeat the process with black paint on the other parts.
This is a quick and easy fix — one of the many tiny details that complete your project.