The general concept for the head that you came up with is fairly good for a simple head. Though I don't understand why your lines are smooth at the top of the head and then jagged towards the bottom and on the straps.
This leads me to believe that you copy and pasted some image as a starting point and then went to edit that image to create your final idea. This isn't bad, but I would suggest that you don't paste images that are a different style/quality from your own art/skills. Also if you copy and paste images onto a head you should also include links to the images you used for the head. Crediting other people's work is important.
Yea like WeooWeoo said though, get Gimp and start learning to use that so you can make cleaner lines and what not. It might also help you to take a step back and just go learn basic concepts before trying to make an entire head. Like figuring out how the mapping works, good shading, small stuff like that.