I mean SandMan's pretty much got you covered, dude's a review machine, it seems
I will say I agree with his talking comment wholeheartedly; your videos seem to be mostly about you directly talking to the camera about the video's topic, and that aspect doesn't seem to be represented well enough in the trailer. Your channel is as much about you and your personality as it is about makeup and fashion, and making it take a back seat is kind of hinders the appeal. I mean, someone's watching the trailer, sees all the "fashion" and "makeup" captions and they're like "K, nothing special here, just a run of the mill fashion channel" whereas what would set it apart from the others, your on-camera persona, is tucked away in the videos themselves. It's kinda weird that the only time we do get the experience the main draw for your channel is when you're asking people to subscribe, lol
As for the content itself, again, I'm hardly your target audience. As a dude, my idea of fashion is putting on pants, and making sure they're clean, it doesn't really go beyond that
My gf will check out your channel though, she might be more qualified to comment. Other than that, your personality seems really fun and cheerful, and really gives energy to the vids, and again I think it's kinda the main draw for your channel and should be a bit more represented in the trailer.
Sorry for not being fashion-savvy enough to be of more assistance, hope I helped a bit, regardless. Good luck going forward!