Hey Sweetiele!
Ok so firstly the technical side of the serves and contact on the ball is good, so keep that up! I think a couple of things that will really improve your serves are trying to stay a bit lower and more forward woth your body position, this will make it easier to contact the ball lower and keep the serve tight over the net and have more control.
The second thing I noticed after watching this video is quite often your first bounce is very close to the net and the ball went quite a few times directly into the net. So really concentrate if you are going for a short serve to get the first bounce on your side about half way up your half of the table, this will stop the ball going into the net.
Lastly, I feel you could be a bit more relaxed when serving which will help you be soft on the ball and also accelerate in more to add spin.
With the reverse pendulum serves at 1.50 I was actually very impressed and you can actually hear the ball spinning a lot as it finishes in the net. You have good use of the wrist and nice touch on the ball again just tey to be slightly lower and more forwards with your body and this will help you prepare for th le next shot too. But keep up the good practice and give those points a try!
