I dated an interpreter a long time ago, I had a barely usable knowledge of it but I knew lots of people in the Miami deaf community through her. Apparently I shouted a lot, because I would kinda strike each word forward with my hands, especially fingerspelling. Think of a cobra striking, that motion. Made people mad, so no one wanted me to sign to them
Deaf people using ASL have to really abbreviate their ideas since it's a time and labor intensive language. I learned early on that someone saying "that shirt looks bad on you" was perfectly acceptable, since they didn't want to say "oh, that's a nice shirt, do they have it it any other colors, because beige would really highlight your skintones"