This is a good idea for the challenge, branches against the sky and I like the concept.
The problem that I see are the branches all around it. Maybe if you had zoomed in more on the ones against the sky, leaving out the others? Also the picture does not appear black and white on my monitor but it could be converted quite easily and then adjust the levels or curves to really make the tones come through, or even leave in color and adjust your levels and contrast to help bring out the blue against the black branch.
My thought process is that if you move a bit to your right and take the shot zoomed in more on just the branches in the middle, cutting out the side and bottom and then work on the levels if the lighting is again low, you would have a much more dramatic and wow kind of shot. Maybe even angle it a bit so the branches come in from the side or corner.
I see you have only been here a short time, not sure anyone has said WELCOME yet, so here you go WELCOME TO DPC! I think you will find a great source of help and information here.
composition needs work, subject matter is somewhat uninteresting. i think the tree w/leaves to the right of the subject tree is making the photo too busy
Not a bad photo, but I wonder how if would look if you cropped out more of the trees on the right hand side so that the branches weren't so centered in the picture?
Foreground is badly under exposed for a "traditional" picture or the composition is too busy for a silhouette. I'm not sure what you were aiming for here.