Hi Man,
The Banner for you channel is really well done it's simple, not too cluttered and explains the sort of things to expect on your channel.
The Thumbnails are good, they could definitely use a little work to add your own personal style to them, but this does not hinder that channel at all.
I personally think your channel would benefit from a Trailer and maybe rearranging and adding a little bit more to fill out the front page of the channel just a little bit more than just uploads and playlist and stuff like that. Just little things to flesh out and make the front page look organized and clean only because the front page of your YouTube Channel is basically your first impression to anyone that comes across your channel.
All in all for the content The video quality is good and your audio is decent

Very nice for 3 weeks! Keep going man