Some notes:

* the head is stiff -- needs to bob with movement

* the hair needs to have more bounce/movement too
   at the least some sorta breezy motion

* the legs are really thin
   you can either stylize this in a more cartoonish format
   or possibly cut out the height and shorten the character
   or simple add some weight to them

* the shin area is animating oddly -- although the feet are fine

* the arm swing is in full windmill -- either naturalize the animation more to dangle












OR for a more arm-to-chest swing, lean her posture into a jog animation, starting with elbows bent





edit: apologies, not one for references but perhaps these examples are better/relevant?

These are just a few technical things atm that I can see

Thank you for helping out

Made some updates

Pet peeve alert: That's a fir (or maybe a spruce), not a pine. This is a pine.
Here's an edit illustrating some of what I said in my earlier post, using solid areas of black and white to show the form:

Tried to edit your illustration down to a 16x16 sprite:
Then made my own -- is this an improvement any?





In mind to what you said about noise and demonstrated
I tried to fill in more rather than dither here - are these results better/readable?

In addition to the trees, I've worked on:
01. Brick Walls
02. Broad-Iron Fencing
03. Windmill
04. Samurai
05. Monster
06. Main

Note for the Brick Walls - I attempted to recreate a curvature wall as seen in castles
I think it's called either a "Bastion" or a "Roundel" (?), not sure

 -