nice job on the BG touchups.. and with a brush too!!   well done!

I usually air brush lit areas on backglasses these days (or spray acrylic, as you probably know), i just take out all of the affected colour and redo the lot. Gives really good results for translucent lit areas.
I still use the waterbased acrylics as well, usually for unlit areas.
i have several that i need to do in my resto queue, results will be posted when done.

Once again WELL DONE  

cheers.. Mitch