“I am not going to tell you my name, not yet at any rate.' A queer half-knowing, half-humorous look came with a green flicker into his eyes. 'For one thing it would take a long while: my name is growing all the time, and I've lived a very long, long time; so my name is like a story. Real names tell you the story of things they belong to in my language, in the Old Entish as you might say. It is a lovely language, but it takes a very long time saying anything in it, because we do not say anything in it, unless it is worth taking a long time to say, and to listen to.” -- J.R.R.Tolkien, The Two Towers
Well thank you, Kippa. I'm happy you like it. The resemblance between the two characters was not a conscious design choice. Perhaps it's just my own interpretation of what a wise, deliberate and ancient being looks like because other than that, Gandalf and Treebeard have very little left in common that would explain a resemblance. I originally thought of making Treebeard's whiskers green like common moss, but the text indicates that his beard was grey. That might be why you drew the parallel. Both have wandered the earth for ages, but Gandalf is one of the Maiar, an almost angelic-like creature whereas Treebeard has always been a tree-like shepherd of the forest.