
This one isn't so bad! ^_^ All I would say is work on the hands a bit more, perhaps not have her leaning back, and The eyes seem a little large O_O;
Advice: For hands, try to keep them proportional to the head..?
For eyes, Just make them a tad smaller so they're not bigger than the mouth? (Depends on the character!!)
and the hands.. well.. I'm not very good at hands either.. I would just suggest to continue practicing on different sheets of paper while looking at a model version of the pose you'd like.. Once your good at it, enough to not need a model, then put it to the picture. That's what I do..

First thing I notice about this one is hands, ears, and pose.
Again, your character seems to be leaning back ( which... isn't good? O_o; *dontknow* ) So just fix that by turning the paper and drawing normally, or set up guidelines before you start sketching.
The hands just take practice, like I said before. It seems his grip on the staff is terribly uncomfortable.. with his wrist being bent upward and all..
Lower the ears a bit more so the very top line of the ear is at line with the center of the eye. That's what I've learned, but that's up to preference.
Otherwise, it's looking good so far! ^__^
I agree with shinyspoon42 with this one. Use foreshadowing to show that his forward leg is.. well.. forward.. and the back is further from the camera, so shade it!
The hands once more, practice with those!
The front-ward foot though, seems fat ><; Make it a bit smaller and then show off a SMALL part of the bottom of the shoe to show he's steping forward. Shade the ground underneath the back foot to show it's off the ground as well.
For his arms, position the back arm so you can't really see the side of it, to make it look like he's running more? And the front arm more frontward and raised a bit below his face.
That's all I've got ^^; Hope it helps...