Advice on touching up?

my dad is convinced that if I try to touch it up if will look much worse than it is right now. I've been quoted over $500 for the whole bumper to be painted, and I don't plan on doing that. I have no clue how to even touch anything up, but I'd be willing to try if I'm convinced it can be improved. also, if touching up turns out to be easy... I've got some chips on the hood I'll be fixing as well..

