I didn't have time to watch all of your videos, but I did watch the first one you posted and the most recent one. Your technique is good. You're not revealing the tricks through bad technique, which is a common problem on youtube. (THANK YOU!)
Your presentations are ok. If there was one thing to work on it would be that your voice never changes, and this makes boring presentations, even if what you're saying is interesting. You need to have some variation in the tone and volume of your voice to make it interesting. It can be difficult to figure out how to do this without sounding very strange. I think that the best way to learn how to use your voice is to take acting classes if you can, and session with magicians who know how to use their voice. Examining the presentations of other magicians will always help you improve your own. I'm going to be honest here and say that presentation is can be difficult for me too. It's something that takes practice, like the rest of magic.
