For the first part, you made it look like you already had one coin in there and then made the second coin join it. When I saw that, I pictured you saying "I'll toss some coins to the other hand and I'll leave one behind. Oh look, now one coin joined the first one." When you snapped your fingers, you flashed an empty palm when there are "supposed" to be two coins in that hand. Of course it wouldn't really matter too much in the real world since that's not where the attention should be, but on a webcam it's different.
Though it's been said before, looks like you got the mechanics down. You just need to work on how to present it and make it look like magic. Keep it up.