This is the only one I like.
The other ones look overly posed and also (with the exception of the chess photo) say nothing about you.
Keep trying you're doing the right thing and it's just a matter of time before you find out how to take good candid-feeling photos.
One huge tip - do more in-action photos. Photos of you standing, folding your arms, leaning etc. with a cool background look neat but add nothing to your profile. Having 1 of those is good, but after that it's just redundant.