Hmmm... that's actually pretty good. The bare branches, I mean. It borderlines pillow shading, but not horribly so.
Spriteman drew something similar for me, but he never bothered to submit it to the database, even though I told him it'd be okay.
The "gnarls" are a bit to the extreme, but I think some gnarliness on the branches is appropriate... I might edit mine a bit to have some more of those qualities.
SD, those Dark World trees are a very nice adaptation for DoR and Sun Tower.
I think you should submit them. I'm tempted to include those in a future version of the DoR set, but I still have a dislike for LTTP Dark World graphics in general, so...