The horizontal shot has her line of sight slamming into the "short side" of the frame, with all of that empty space camera left...this is simply the wrong approach to composition, unless you deliberately want to create visual tension. Having her off to the right hand side of the frame is a major compositional no-no in most cases. This looks to me to be a misuse of the common folk wisdom of "the rule of thirds", which is a made-up, new thing with no basis in actual fine art history (do some serious research and it's clear where "ROT" came from!).
I agree with destin's C&C.
My biggest issue of concern after the use of the compositional area is the weird eye coloration...that eye coloration just looks unnatural. I have never seen a human with eyes of that color...it's just over the top.
The light you found and the light you created is nice. Perhaps more subtlety in matching the flash with the ambient lighting? The rim light is nice, as is the back-lighted backdrop!
As far as "getting better", I feel like I got better in stages; first at five years, then at 20 years, then at 35 years, then at 40 years behind the lens. I made some big leaps, in each decade I was shooting pictures. Now, with 44 years behind the lens, I can make pictures that I like,easily, wherever I am at
A couple things: In shot #1, her blouse makes a rectangular shape; perhaps a clip behind could be used to crete a waistline or bustline shape clue, rather than the way the garment shows up without a stylist managing the clothing's shape on-camera.
The more close-up photo...her's a crop of it, designed to eliminate the clip on the left side, and to give her eyes some space to look into.
I do not think this is a successful photo...even cropped...the blouse looks unattractive, and does not flatter her figure or face...
THIS photo, the way I have cropped it, is much better than the way it was originally shown, IMHO.