Need hair painting tips, please!

Can anyone give me pointers on painting hair. I have done it several times, and it comes out ok, but not as good as I want. I have watched tons of videos and no matter what I do, I cannot get the consistency that I need. On the tutorials, they just paint nice, long strokes so easily. I do good to get one stroke. I’ve tried different brushes and mixed it different ways and I’m still not satisfied with it. Any tips are appreciated!! Here is

a couple of pics of the hair I did and while, I think it’s ok, I think it could also be a lot better!