The face and posture make the character look sorta stiff and clueless like a scarecrow or something. The eyes seem like they're facing outwards a bit too much (like the opposite of crossed eyes).
I'm not sure if this character is meant to be male or female... If female, it could use some breasts, even if small ones.
The folds/wrinkles you put on the pants make it look as if it's being twisted or something.
Hands are tricky, I know. The first step is challenging them rather than just drawing fists or balls for hands. The next step is to observe the difference in the length of fingers. Hold your hand out in front of yourself. The pinky isn't as long as the other fingers; it only reaches to around the last joint of your ring finger. The ring finger and index finger are around the same size, and the middle finger is the longest.
Also, check out where your thumb starts - it doesn't start in line with the rest of the fingers.
My last advice on hands for now is to avoid trying to cram all the fingers onto the picture. I've done it lots before, too, but you have to realize that it looks awkward. In this case, you would've been better off if you drew the hand on a sort of side view, and the pinky (and maybe the ring finger) wouldn't even show at all because the rest of the hand would cover it. Having a straight, stiff hand like that is awkward in itself, though - don't be afraid to have some fingers bend/be more relaxed.
And if this character is wearing normal pants (not shorts or capris or something), those legs are too short. What you have here would show to around the knees, but certainly not the calves. Anyhow, that's only a problem if these are normal pants.
Also, jeans and dress pants have a zipper at the crotch (covered by that flappy thing). If these are sweats, that doesn't really matter, though.
Lots of areas need improvement, but don't give up.
Oh, and if your lines aren't showing up well with the scanner... If you have ink pens or fine tip markers, those would be best. I used to use black pencil crayon for my outlines once upon a time since I didn't have pens or fine tip markers... but if you have pens/fine tip markers or if you can get your hands on some, you should use those.
Also, your scanner wizard might have some options. For your size problem, your computer might let you resize the image right then and there after scanning the picture. There might also be a "grayscale" option, which will probably make your lines show a bit better or more like how the original is on paper. For example, here's a picture I scanned a long time ago:

You might go through your black pencil crayons fast, but you could also try sharpening them before doing the outline (and making sure they stay sharp).