Thanks for the advice again. It's hard for me to be this bad at something, I must have tried that trunk about 40 times before I finished, and it still looks bad!

It's the small scale and colours I think - it just throws me off. Working with such tiny units makes it difficult for me to get the shading and form accurate, then when I try and use colours imaginatively I fail even more astronomically.

If this was pencil sketching, I'd have a chance because it's more "feel" than anything else. This just throws me off because pixel art is very mechanical.
I go to shade stuff and I basically don't know what to do to make it look appealing, especially when I've got to pick colours. I don't know where to put the pixels, it feels really random when I try and place 'em. Pixel art has its own rules that don't come naturally to me.

This is the best way to learn though, so I'll try and redo some stuff tomorrow.

EDIT:
I've done some more work on the tree.