It should be acceptable as a Nature picture. Crop out the bushy foilage below and it might even go so far to become 'Abstract'.
Though I'm not in the position to comment, I have to agree with Solarii that a good picture should portray a clear meaning and subject (theme) and you should choose the best subject matter (in this case, the tree branches) to convey that message. For example, think, "What do I want this picture to say to the audience? How can I make a silent picture speak loudly in words through its content? Do I need more colour, more shape, line, form, patterns, shadows or more effective lighting?