I'm no pro but I think you need to get an appropriate lens and get out and practice more before you think about selling. I'm on my cell phone and the shots look slightly blurred. In the first one the bird stands out pretty well but the blurred branches in the foreground are very distracting. The second and third ine you have to look for the bird amongst all the branches and dead leaves. There's definitely some potential but at this point I can say that I personally would not pay for photos of this quality.