I had to give you my opinion on your artwork because it's simply fascinating. Not only that, but it feels like there's not enough attention given to the art section of this forum. Instead of you thanking me, I thank you for helping me formulate an idea for my conceptual opposites for my painting course.
For the most part, your visual transitions are great! Each segment feels equivalent in length, which is good for portraying your artistic skill. The only one that feels awkward is around 0:38, where it has a double transition in 1 second. Since it's minor, it should be easy to fix. I like the idea of seeing you talk in your promotional video. The only problem I have is that there's only one part of that. If you want to go that route, I suggest just a couple more as short breaks to delve more into the other clips you already have. Otherwise, you could altogether abandon it.
Sound is actually pretty fine. In fact, I'm impressed that you were able to speak without much awkward pauses or anything of the sort. Around 0:34, I noticed the unintended spike in volume when you tried to pronounce "a". Again, this is a minor error that could be fixed. If this is allowed for your promotional video, I would personally add an instrumental to compliment the video. I always found that visuals and music have this strange bond that can capture the audience's eye. One last thing to note, I'd suggest rolling credits once you're done speaking.
Overall, this is pretty great for a first shot at a promo video! It just needs a few tweaks and it'll be perfect!