I painted the inside housing of my headlights black. I thought the signal housing would look silly silver so I also painted that, but now my signal looks dull and cheap. Any suggestions for making my turn signal more sharp and professional looking?
You could try to open them back up and painting it a silver or trying to find chrome paint. You just want something reflective back in there. If you haven't already, you can add an LED bulb for more brightness but that doesn't help the overall look you described.