I’ve just finished your video. Overall, I liked it. I particularly liked your friendly tone, your background, and the way your beautiful babies were arranged so nicely and perfectly in frame.
Warning; because you asked for a critique, I watched it as critically as possible. Here are a few small things that you can do to improve.
@Leabelle was absolutely correct, you should always face the camera when speaking, even if your face is not in the shot. I learned through live theater performance that when you face away from your audience, they can lose much of what you say. Your volume faltered a bit throughout the video, but that could have been down to my horrible laptop speaker. Your giveaway babies looked adorable…but they were a bit difficult to see. Perhaps your lighting or your white balance could be adjusted to help show off details? You rambled a little bit, but I think much of that was down to nervousness.
You apologized for your pronunciation too much. I completely get it! I don’t know how to pronounce many sculptors names either. If I were brave enough to make videos, I would make a disclaimer statement at the beginning of the segment where I planned to mention sculptors saying something like, “I apologize in advance for the mispronunciation of any names, but I’ll try my best.” Then I would try like heck to get through them as smoothly as possible without letting myself stop to apologize or second guess. Again, I think you’ll get more comfortable with each video you make.
Regarding the handling of your babies, you jostled them around a bit more than some people prefer. If you try to keep in mind that the kit is sleeping and do what you can not to “wake” it, it might help. As a fellow artist, I wasn’t bothered by the way you held them, but then I carry a head and limbs around, one on each finger. 
As to the content of the video (and this is nit-picky, but…) you seemed to have not had a specific audience in mind. You began by explaining what reborns, realborns, and cuddle babies are- as well as the history and process of making them. Later on you seemed to be speaking to artists, telling them where you buy your cuddle bodies and providing reviews of the different types. All of the content is good for videos, but perhaps splitting them into separate videos based on intended audience in the future could work out well.
This is completely from my own personal preference standpoint, and I know it’s sometimes hard to resist- but baby talk fits in really well with reborn roleplay/changing videos, but shouldn’t be overly used in other types of videos.
I really feel like a jerk now, but I wanted to give you as much of a critique as I could manage. Please know that I enjoyed your video very much and I look forward to seeing more.
When you are more comfortable, perhaps you can film a video with you on the screen holding the babies and showing up close all of that wonderful detail that you paint so well.
maybe put them on a blanket or a cushion ?
As far as watching long videos, it depends on the video and the interest level it holds for me. 
