Paint and screws question Options

[zeromuch]

Hi all!

Someone was able to hit my Celica when he/she was parking and some paint came off Now I'm trying to just fix it up a bit with a touch-up pen but the paint is really matt (not glossy), while the rest of the paint is shining/glossy. I'm having a hard time finding the correct english words for it, but I guess you know what I'm talking about. Any tips to make the paint as close to new?
The previous owner had the car repainted, but it appears the paintjob was of poor quality and there are some drips on the paint. I would like to get these out or just make them less visible but I'm afraid I'll mess it up even more, some tips for that would be great too. If it'll be too much of a hassle I'll just leave it like it is.

There appears to be a plastic plate on the bottom of the car. I think it's there to cover the enginebay, although I'm not sure. Some of the bolts holding the plastic are missing and I want to replace them. Anyone knows a partnumber or just what bolts to get? (they look like a hex but could be Torx too, didn't took a good look).
I could post a picture if needed.

Thanks!