Well, you uploaded your work for crits. Thats a lot more than a lot of other artists are willing to do. So good job there.
You are right though, not much to really crit on. I do suggest you ask for a scanner for christmas though.
Life drawing. I'm sure you have seen enough people mention it here. It's the foundation of these forums and
the best way to improve your art. Draw your friends, family, as well as household objects that interest you.
Get yourself a good book on figure drawing. I personally recommend Ron Tiners Figure Drawing with a Model
Don't work from your imagination yet. You must spend many, many hours feeding information into your imagination before anything worthwhile comes out of it. Draw from observation. Draw stuff in your environment, draw yourself in the mirror, draw from photos, draw from master drawings.
I was once on the receiving end of a critique so savagely nasty, I marched straight out of class to the office and changed my major (sketchbook).
Get a scanner, your camera isn't up to the task... you aren't even holding it straight. Photograph artwork, if you must do it, on a white or neutral background, filling the frame with the artwork as much as possible. Use even lighting. Use a tripod and remote control. But, better still, get a scanner.
Second: Look at the book called "Cartoon Animation" by Preston Blair. It shows the basics of drawing that you need. Then proceed to "Successful Drawing" by Andrew Loomis.