Trees!

[BluGil]

Check it out

This is the boring uncolored one

I played with some layers after doing it and made some versions with ridonculous colors but won't be postin that now

[Vonschlippe]

It's interesting, to say the least.

I believe you could make it better by displaying more context to your image (right now it's just floating). You could also bring out the texture of such a gnarled tree by varying your line width and incorporating textures to bring out some grain to the overall picture.

There is also an issue with the level of detail on the lineart, seeing as tree bark has a generally uniform texture. You could perhaps make the image more balanced by adding lines and detail to the lower half of the tree in order to match the level of detail on the branches that are at arm height.