Upload your pictures here: 
I, personally, prefer matte photos, because sharpie rubs off easier on glossy. But you may prefer glossy.
I usually just send a picture from a photoshoot, sometimes of a still in a movie.
I have seen people get artsy on them, and get replies on the artsy photo!
And, yes! It's perfectly fine to tell them why you liked them in a certain role! I write that all the time!
