Thanks for the quick replies!
I forgot to mention that this is based off Oak trees, as I learned not to just draw a 'tree', of course I have to define what kind of tree I am going to draw.
However, most Oak Trees have very large canopies, as of which I am not able to fit in, therefore, I have to make it a bit smaller than usual.
In the few pictures (no particular reference) of Oak trees that I found, the roots were large above the ground, so that's why I am doing them that way. I'm sure they're even much larger under the ground.
However, if you believe they should be less wider/bigger, then I'll see what I can do.
I'm not sure how I should go about doing the actual canopy yet, and still want to get the base right, and make sure I have it right, before I begin working on those.
Also, having the branches lower than they are right now is indeed a fine idea, it will give me more room for the canopy.
EDIT:
Quick update on the tree:
Oldest to newest:
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Fixed some height and perspective issues. Again, you can ignore the shading.
Also at one point, I attempted to create a branch which was coming out towards the viewer, but I don't think/know (if) I did so well..
I guess I shouldn't try to input what I have no idea on how to do, eh? I can fare without it..
So, about the main piece, am I going in the right direction? C&C? And, comments on my stone path are still welcome, at least tell me if I did perfect or something.. (which I know I didn't.)