I, too, like the amount of space, but I think a bit more space beside the titmouse's tail would help. It looks like he is just barely in the frame. (This may not be possible , since I haven't seen the original)
Jack, you have a nice titmouse image here! I do think a few changes would make it stronger, though. I am not a big fan of all that negative space at the top - I'd be much more inclined to do a horizontal crop here with just the bird and branch in the frame. I also think he's too close to the left edge - a bit more room there to help move him to the ROT's position would be nice. And, because the front flower is OOF so badly, I'd either clone that one out or I'd crop the flowers out of the image so everything was sharp and in focus.
Lovely exposure and nice BG - many strong points to build on here!