Allow me to pick your brains again if you will

Im at the oil wash stage of finishing my Me109 and 2 questions for you,,
1.What would be a good colour to wash over yellow,,that is the nose and rudder areas.
2.For the topside grey splinter camouflage,,would a black wash be too dark,,if so what would be a good colour to bring out all the rivet detail on the wings?
Looking forward to your comments and advice
