Really hate being picky, but I love trees, and Silver Birch are my favourite!
Silver Birch trunks are (nine times out of ten) a lot darker at the base of the tree than the rest of the trunk. Especially when there are deer around to tear the bark off. Look at your comparison image, and you'll see Bethesda captured this well. Here's some reference images to further prove the point:
http://wwwdelivery.superstock.com/WI/223/1566/X1004/PreviewComp/SuperStock_1566-0150568.jpg
http://www.flickr.com/photos/forpaws/2728647465/
Your version textures the whole thing to look equally white, which doesn't work for the base unfortunately.
and again, it's not a finished texture, I'm aware on how a birch tree looks

Read the red text in the OP

But thank you for the tip anyway, appreciate it
