This is a slow forum, responses can take time.
In addition, you posted your art as attachments, which can't be freely zoomed, unlike embeds. This makes viewing your art a hassle, and can dissuade people from trying to help.
Your work feels rather flat, it looks like you're struggling with shadows. Thinking in 3D and shading accordingly can be a tough concept to fully grasp, but doing some (non-pixel art) exercises in drawing and shading simple 3D forms and then putting them together into more complex objects may help you.
The colours on the bear are nice, you've got some nice hue shifting from warm to cool/purply brown there. That's a good technique to employ. However, you seem to be using a very large number of colours relative to the size of the sprites, making the whole thing look blurry. It almost looks like you scaled down a painting or a simple 3D render.