   How to paint  better UV map texture?
  I suceed to unwrap those UV map (not sure if it is the right name) now I have to texture it. *** How to get better at those paiting texture? *** I am sure it can make a big difference.   
  In order to get better in anything, you just need to practice. Also, the better you know the theory side, the more you'll be able to take advantage of the collective knowledge and skill that others before you have generated.So, practice and read about the subject as much as you can!   