Very nice shot, Jen. I think you have some competing elements in this photo . . . the root structure is impressive, but so is the top part of the tree. Add to that the brightness behind the tree trunk. So my eyes are not sure where to go first. It all depends on your artistic vision. You stated that you liked the root structure, so I'm guessing that's what attracted you. You might try cropping out the top part so that the brightness of the water reflection is gone or shows very little. Then really bring out the texture and details of the trunk and root structure. The next time you go visit this tree, try to shoot from a different angle so that the water reflection is not behind the tree and get some bokeh in the background.
This is a nice photo to play around with in PP and possibly get something spectacular.
IMHO