It's not too bad...probably the 1st profile I have come across where there is no shitty mirror selfie pics.
1) Your pic is lacking one really good detailed quality profile pic
2) Your 'About me' is boring as hell and is desperate for paragraphs. Try to be more witty, simple and funny.
3) Delete the 2nd pic, it confusing, no need to create competition with the POF girls. If she is your sister, then keep it, but make sure you put a relevant caption:
'My beautiful sister, obviously, I'm not the only one with the looks in the family '
4) POF is a waste of time man, you might get lucky with an occasionally socially awkward single mother. Tinder is where you're gonna get the most results. Keep playing around with the profile pic till you get a sense of which one gets you the most matches.
This website helps too:
http://www.photofeeler.com so you can get 3rd party people rating your pics.
5) I know this might sound confusing, but even if you're looking for a relationship, I would switch it to 'Not looking for anything serious' - I personally feel that you give away a lot of mystery and power when you do that, but I wouldn't say it will make or break you. My other points are more of the priority than this one.
Good luck