Weathering question

I have a canvas top for an RSO painted dark grey. What color do you recommend to do highlights on corners, strap ties, and window outlines. Should it be light grey or buff as a dry brush or something else?

Thanks for your input.

Leddy

A medium to light gray would go well on that.

dito regarding the lighter greys for the high spots. I would also use a very dark grey or black pin oil wash on the folds.