The diversity in your line art technique is spectacular.

 I've submitted a revision to this piece - there's a problem with the hair placement at the right side of her face (I forgot to fix it after making revisions to the chest placement).

 Thank you very much for the advice. This is the first time I've ever tried to draw a tree, and it's quite harder than I thought it would be.

 Amazing.

 Love it.

 Amazing, but Naruto's nose isn't that big.

 Hmm...Personally, I dislike dithering as a shading option, but it kind of works here. However, the left side of the orange icon doesn't look nice (The thing he jumps on). It needs to be single pixel line thickness in my opinion. It will make the icon look more rounded. 

Other than that, kudos ;)

 Great icon, but I dislike the blockiness of the leaves. Maybe try making it more of an oval shape?

Alright, here's my thoughts.

I dislike the orange/redness of the skin. It doesn't look good - try a color that's browner.

The legs look weird. The thighs and upper legs need more thickness.

Your animation needs at least one or two more frames, or the delay between the frame switches needs to be changed. (As it is, it looks like he's flicking his arms up towards his chest every time he takes a step. Also, the legs look like it's under severe strain from gravity, and they snap to the ground after the cycle completes. It looks unnatural.)

Another thing, it looks like the person is moonwalking. Try moving the entire icon one pixel down or up between frame switches.

Other than that, it's a great attempt. Kudos ;)

 Love the bounciness, excellent animation. Kudos ;)

 I love the stance, but be careful of line break errors - especially on the legs and arms. Also, she looks very pale. Maybe use a darker color for her skin? The hair is nice, I love it. Though, the dark line on the top right of the head should be recolored - it doesn't work with the shade.

 Submitted a piece, it's awaiting approval :D

 @ A.B. Lazer -  I was going more for an anime feel, so the shading should be looked at in terms of anime-characters (Which rarely have any shading on their bellies). Thanks for your advice, though! I'll work on the arms ;)

Thank you for the advice.