I’d call it Not Bad for a demo, particularly as a first effort, but IMO it’s not a finished product yet. Some of this may be personal preference, so take it as you will. Being brutally honest here, and when you read this, understand that your work is good enough as a beginner that I’m “grading” it as if it were a seasoned pro’s work.
Your lighting needs more work: not a lot of contrast , or way too much: too many shots seemed to be using only available light and had dark areas that detracted from the look. The actual dresses looked like they could use more artful lighting as well. Some of this, you might fix or moderate in a grading session in post. The next time you shoot, though, work on targeted lighting more.
I was not a fan of all the hand-held camerawork: little of it seemed “motivated” to be hand-held, and I think particularly when showing the app being used, those shots should be locked-down, presenting as little distraction as possible. DGMW: a lot of the shot *composition* was pretty pro looking, but the shakes didn’t add energy, just an air of indecision.
The close-ups of the app are still WAY too teeny for me to see and “get” what’s happening: Also, your explanatory copy running parallel with the demo means I’m dividing attention between the two and thus not really looking enough at either. If I could change ONE thing in your videos, it would be those close-ups: locked-off shots, REALLY tight, showing app, THEN app’s effect, sequentially. Replace the printed explication with a voice-over, so your eye stays on the APP.
Finally, in terms of the editing, the pace is a bit slow at the beginning. You are showing too much “dead time” with the actors. You could compress this action all throughout the pieces, much tighter, using jump cuts.
I think you have a fine foundation here but it’s those little details that take you over the top. Looking forward to the revisions, which I’m sure will be more effective.