A lot of them seem a bit too posed. Do you play guitar or something? A pic of you enjoying hobbies would be more natural.

Apart from working out, a beard/stubble would suit you well. You should try minoxidil. Buy the foam and apply to your checks twice a day.

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Unfortunately none of these work. When you're this skinny, I would suggest wearing two layered clothings for pictutes. Shirt and suit or T and jacket. You get the picture. As a side note, definitely have to do something about your weight. You will come across pretty meek with girls and in the profiles

You look pretty good but def need to start lifting and eating a lot. Until then use 1, 2, 14, 15 and take some more pics playing or cuddling with your cat, maybe playing a guitar if you, your friend or someone has one etc. Good luck bro you got this!

Huge improvement from the first round of photos you posted. With these you have a much better shot with online dating, unlike the previous photos. 1, 3, 13 are good in my opinion!

I would still try to work on fixing your hairstyle. Google a "comb over" hairstyle. I think this would work a lot better than how it's currently lying flat and straight.

1 and 2
Man bulk up and fix the nerd neck it will change your life and it's only a few months of hard work

the best one is #15. there rest i kinda like:
1, 2, 13

def think you need some dog pics, and some activity pics.
additionally think you def need to bulk up some.

Good effort.
3, 7, 2
The ones you look serious are way too serious, serial killer serious. Haha