I used to shoot professionally and looking back there's things I would have done differently. First is I would take more time. When I shot for clients I had to shoot quickly because we had to get a lot of work done. You should find a model and do an outdoor shoot. The second thing is I would only pick the best images to share. No one wants to look at 5 pics of the same thing.
Your pics have some interesting ideas. Keep that up. And you should buy some pro lighting. A cheap 3 piece kit with stands and umbrellas. You should buy a softbox also. If you want to take explicite pics you'll need a flash. Get a softbox for that. You can buy a Canon 20D really cheap. It's a good camera. Buy a new 18-55 lens. Good luck.