Your work looks good from what I can see, but the pictures aren't doing you justice. Firstly, the photo - We want to see more of the nails and less of the hands. Either take nice close ups or take the photo from a normal distance and crop so you see mostly nails. Do a quick scroll down Instagram and copy some poses with your clients hands. And then the borders/collages. You're wasting so much of your square on a big white border. Crop the picture to fill the square, rather than downsizing to fit the whole picture into the square.
Your timings will only improve with practice. Have a set routine that you follow everytime. This really helped me stay on track, I'd find myself just sort of floating around thinking of what to do next. Just work down your steps on an imaginary list on your head.
2/3 sets p/m isn't enough practice, as you say. Grab as many family members or friends as you can, and use them. Warn them in advance about realistically how long you're going to need them, and get a full set done, no distractions, no phone, no TV, minimal chit chat and time yourself. Then you've got a time to beat for your next set. Or get yourself two practice hands and do the same. Don't worry about the nail art until your basics are spot on. You can practice nail art in your own time on nail pops.
Post pictures of EVERY set, even if you don't love them. Someone else will. I'm always shocked when I get a new client from posting a set of nails I hate. Everyone has different tastes.
Are you checking in on your clients? Are they happy? Have they had breakages? I found this video very interesting and might help you.
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Good luck!
I'm going to drop you a follow on Instagram x
