Couple request

Whew! After monthssss of slaving over this drawing, it is finally finished! A friend of mine asked me, if I wanted to, to draw her a couple. This was back in October. I had it "done" multiple times, but, considering this was my first digital drawing (and also, the person in question is like a "new" friend, we never actually spoke to each other before... she's quite nice! C: ), I wanted to see what I was able to do with my NEW WACOM INTUOS 4 I had gotten for Xmas. At the end of it all, I had redid a little bit of the lineart a few time and completely redid the coloring process three times before I came with this result.

THREE FREAKING TIMESSS (*at least* to top it off!)

But, after figuring out photoshop a little more, I have found the "paint brush" brush I was looking for, and went crazy with it. Literally.

BUT NOW THAT IT IS DONE, I must say that, the end result is quite satisfying for me since I've never really tried this coloring style before (and which I wish to continue and improve). There are many mistakes that I noticed afterwards, but, seeing that it's been more than 4 months my friend had been waiting, I decided not to dwell on it much longer. I might fix it if I feel like it, but I doubt I'll ever touch this piece again XD

But, I would like to hear your comments about it, what could be improved (especially for the coloring, I wanna know tricks and stuff that could be useful •w• )

EDIT: AAAHH I forgot to mention where I got the textures used! DDD: /shot

Concrete texture: [link]
Brick wall texture: [link]
Curtain brushes: [link]
Jeans texture: [link]

C: