It looks like the pixels aren't the same size on the tree trunk, too.  It doesn't look the same in the animated trees as on the still image.  Are you sure it's upscaled by an integer (e.g. 2x, 3x)?  Are you applying the deforming animation before or after the upscale?  I'd probably want to apply it to the 1x image before the upscale to avoid multiple resolutions or uneven pixel sizes.

Thanks Jad!  Seefour, Here's what you seem to have after removing the filters and scaling:



This is what we would like to see, but if you ever do need to upscale pixel art, make sure that the new size is a multiple (e.g., 2x, 3x) of the original size. Your image seemed to be scaled from 66x66 to 100x100 (1.52x), which created unevenly distorted pixels, and there were some even smaller 1x pixels created by the filters you used after upscaling.  I suggest working at 1x only, otherwise you stray into strange territory.

As Decroded said, most of this image is rectangles.  I think you've mastered the skill of drawing rectangular borders and it's time to move on!  I wonder if you are doing what I did when I began drawing: instead of trying to draw what I was imagining or wishing I could draw, I only drew geometric stuff because I was comfortable with it, and I was quickly frustrated when I tried to draw a person or a tree or a dragon and it looked nothing like what I wanted it to look like.  Unfortunately this only caused me to become good at geometric stuff that I didn't really want to draw!

I like Jad's question: "What is your idea with this piece?".  I'd like to also ask: What do you want to do with pixel art?

You forgot the arms!

I like the new, less-saturated ground color much more; it makes the characters more noticeable, and red riding hood looks redder.

Would you like a criticism barrage?
Spoiler