Link 1:
Learn a better double lift, better than both of those.
Link 2:
If you are going to to do something a little longer than just a change, drop the music and just say something. I prefer the full deck version, but your the steal was nice and clean. Only using 8 cards makes it very obvious how you know which card they chose, leading them to the method.
Link 3:
Okay, I'm starting to notice its the same song, dont do that. That control is rather difficult, I can't really tell if its the wrong angle or its a little hard for you, but it was not at all believable that the card sticking out was the 6. Maybe use a different one in the future, or a better angle, front on will look better than the extreme right angle you used. But the overall performance was quite decent.
Link 4:
Again, no music, more talking. All the moves are a little cliche, but thats not a bad thing necessarily, one specific thing is when you pick up the 'ace' from the surface, place it on the deck, then turn it over, it looks weird and is not at all motivated, why not just turn it over on the surface? The key here is to put it on the deck, have an off beat, then turn it, this can be accomplished with patter, or I've used it to great success as a card to wallet, by putting the card on the deck, putting the wallet down, and then turning the card. The point is to have a beat in between.
Your sleights are generally pretty good, all pretty acceptable. Well done.