I like the gnarled look of the tree, and that its branches are so huge that they stretch over the entire picture. It's a wonderful atmosphere full of secrecy you've managed to capture in this picture, for who's is living behind that door?
I am happy to admit I am certainly not the first to entertain the idea of a treehouse with a door - I think it is a universal fascination, but this is my own take on the theme. The branches I hope give the impression of age, inclusion, and a dose of character as if the tree has a consciousness of it's own.
I live surrounded by beautiful old oak woodland, and as kids we always imagined that there were fairies and elves who lived inside the big trees, if only we could spot their doors. Beautiful realisation of this concept!
I think this contrasts beautifully with another very fine work of yours, "Away from it all". This abode is surrounded by twisted, gnarly old trees, an ancient, musty air envelops everything. I don't know if you put hidden imagery in your works, but there seem to be watchful eyes all around. I also love how you add subtle changes in terrain, the ground gently sloping down at the far back. The overall mood of it would appear to be one of bitterness, ill-will and malice, if not for that patch of sunlight falling in front of the doorsteps. It looks like a hermit's dwelling now. From spreading gloom onto a coarse pathway aglow in the soft, filtered light of mid-morning. Splendid! Away from it All is quite the opposite. A cottage nestled on a cliff's edge, wide open spaces all around, a gentle stream, fresh breeze, birds, a lazy afternoon; all the right elements that make a perfect family vacation. All, except for that darkness hiding among the trees on the left. What I want to emphasize is how light, or the lack thereof, changes the feel of a painting, and you, my friend are a master at it. Sorry for this very long comment, but I felt I had to write it. Super creation!
Interesting - I never thought of it as conveying ill-will or malice, perhaps more mysterious. I certainly concur about the power of light to dictate the mood of a picture, and more specifically the placement or absence of light. ...No apologies for the long comment - I love talking about the subtleties of art. Thank you, I appreciate your interest!