OK so I own about 12 Seikos (and a few others) so I do watch a few watch videos here and there (though less than I used to when I was actively buying)
OK so, rather than recover in detail a lot of the advice already given I'll make a few comments about the video and on some of the advice above. Naturally it's simply my opinion.
1. Grab the viewers attention, tell them what to expect in the video (you did this)
2 (optional) BRIEF channel logo/intro say 5 seconds.
3. Straight into the content and deliver what you promised.
If it can be covered in 7 minute, don't make it a 20 minute video. The retention graph says as much.
Think "If I was interested in this watch and searching for videos on it what would I most want to know about it?"
B-roll. Yes, use it but don't overuse it.
Good use of b-roll in a watch video is
- showing the intricacies/close up of the dial face.
- showing the lume
- showing the mechanism (in the case of a see through case back)
technically as pointed out above, editing watch videos does require some thought - given that we always have the time on the dial jump cuts are easily noticed.
I'm conflicted on the white glove thing. I don't necessarily agree it looks more professional BUT it certainly helps keep the watch clean of fingerprints which helps a LOT for the close up photos/video.
Asking companies for free watches, early on, (unless they are very inexpensive watches) is not going to wash. I'd suggest a better plan if wanting to review more expensive watches is ask for a review watch and that you'll return it. You shouldn't expect companies to build you a collection of watches simply on the basis you have a YT channel.
I assume you are watching other watch channels too. It's a great idea to do so and you'll pick up some 'tricks of the trade' that way but don't ever try to directly emulate those channels. You need to find a reason people will watch you, rather than (or as well as) those other.
Given the type of videos you've posted I recommend you look at "Just One More Watch".
You don't need your channel logo in your thumbnails at all. And getting rid of it there solves the legibility issue straight away
If reviewing a watch with day/date complications decide in advance what date and time you are going to have your video go live on youtube, and when filming have the date and day set to that. It's a subtle but nice touch.
Join online forums for watches. Don't spam them to promote your videos, Reading the forums will give you a good idea of the sorts of things people ask when a new watch is released.
As mentioned above, you did do "a very good job at constructing your video description" and that in turn will help me do so.
I agree re giving people a reason to like and subscribe and comment that is a benefit to THEM. I think it's perfectly OK to ask people to do those things, as long as you aren't nagging them.
Sound levels - learn a bit about how to modify that in whatever editing suite you use, read of on volume normalisation and audio ducking.
A good way of getting contrast with text in titles (on the thumbnail for example) is to use a drop shadow to help separate the text and background.
Make sure the camera doesn't shake AT ALL.
There's a lot of potential for you - go for it !