Here is an updated image with a little more 'interest' in the immediate foreground, should've done something of that sort to begin with... Thanks for the nudge. Also increased the haze density to put a little more 'atmosphere' between the foreground and distant hills. And upped the AO from 1.54 to 2.0.
Seems a consensus vote for the tree, with a few qualifiers as to placement, thanks!
TheBadger: sorry it's blocking your view, take my word aside from the lovely unclad babe behind the tree, you ain't missing much

TU: Always a pleasure when you stop by to comment. Thanks for the tips, and indeed I did add a couple of tiny fake rock populations into the foreground area. Hard to move the tree at this point as it's supposed to be growing from the creek bed (which is usually very dry). I'll probably return to this scene and find some other POV's; it's set in a large World Machine .ter file (542 megs). and is composed of gentle rolling hills with small ravines and lots of erosion.
Thanks to everyone who spent time viewing and commenting on this image, really appreciated!