I like trees against the sky like this too. Perhaps either a few more or otherwise a no pink clouds would help, the ones at the bottom right spoil the overall uniform blueness of the sky and yet are not enough to provide overall interest. This is of course my own personal taste, I like simplicity or complexity, but not much in-between. Also, you might try some noise reduction on the sky.

The leaves do have a wonderful lace quality to them when silhouetted like this and this is a good image with a good balance of light.

I like the trees against the sky too. I'd put this through Photoshop or some other program and kick up the lightness a bit, add a little contrast (not too much, though).
Very serene, sets the mood of a quiet summer evening.

Just the right night lighting to give it that special effect.

It is really a good shot. The sky visible in between the leaves has amazing colors.

Feels like you captured the exact moment someone would feel a cool breeze and toss on a sweatshirt. Great shot.