#2 and #3 are good representations of how the logo can appear as a water mark. I do like #5 of all your designs the best. I like the creativity of using the shutter as the back ground for the bird, and the feathers on top of the head color red is realistic of the Northern Cardinal.
Wow! I really like what you have done with #6, very realistic and yet creative display of the shutter and adding a leaf, as if a branch. It really stands out! I like #7 with the tail being visible.