I have a tutorial " Creation of brushes in the Photoshop ", translated on english. I shall ask someone to give me the link to it. In the Photoshop to do brushes itself is easily. The most difficult - to make really helping brushes, brushes for yourself. I could download packing with my brushes, but I do not know how here to load similar files, except for graphic.
Do you have that tutorial uploaded at DA? I'd love to take a look at it I'm sure the brushes can be uploaded here, because I've seen another user do that. I'll ask him/her how to do it and post here.
I like it, though the head seems rather big in comparison to the rest of the body, it would be very hard for her to walk, much less preform assassinations like that.
I understand, to me it seemed like you were going for an almost realistic style and seemed off because of that. If it's anime though, then yeah, big heads are the norm.