Some fantastic and very inspirational work you've got there
Lots of different environments in there, which is great.
I would recommend to also have a standard portfolio website with images. Makes it easier to see all your work in a very short amount of time (provided the layout of the site is easy to navigate :P). You have a lot of stuff to show, but as already mentioned a demo reel should no longer be than 2-3 minutes.
The idea with commenting the video is nice, but not performed to well. For example at 1:18min you're mentioning that you can find "some uv stretching and other issues in the model"...it's kind of funny but not really good to present yourself because it could leave the impression that you were too lazy to fix it or something like that.