Well done on completing your first set, it's a nice feeling isn't it?
I have to agree with the comment already made, the pic is too small to really see anything in detail but the 3 things I picked up on are:
Smile line too high, it would be a much better result if you used a cover pink (NSI have some beautiful new cover pinks) and elongate the clients nail bed if they have short nail beds, very short nails or bitten nails.
Next is your pink to white ratio, the white free edge is way too long and this makes the nail bed area look fat and stumpy, a quick way to fix this problem a little and make it look a little bit better is to just simply file down the white. The idea is to go 2/3 pink and 1/3 white and this will give you a more balanced looking nail.
The last thing is and it might just be the photo but the tips look a little wide for the nail. Remember to keep the bulk of the white in the middle of the smile line to build towards your apex slightly and then taper the edges out slightly so you don't get bulky sidewalls and tip on the free edge.
If the client wants to have long nails, don't use total white to add the length, use a cover pink to extend the nail bed and then use 1/3 ratio for the free edge and explain this to the client so they understand what you are doing and why.
I have actually made up some color pops to show this issue to my clients. I made one that has a high smile line and long white free edge and then did another one with an extended nail bed using cover pink and a small amount of white and when the client sees them, they can straight away see the difference for themselves and I haven't had one client yet, go for the unbalanced stumpy pink and white.
Keep practicing sweetie and you will get there, we all had to start somewhere and the best thing you can do is take any advice as constructive criticism and not as a fellow tech being mean.
The best way to help you is to point out where you are going wrong and this way you can improve on it.
