He/She was having a good time, eating the remains of the cherry blossoms...
The second 2 are better I feel, the bird stands out more, isolated.
These are very nice images. The colour is so rich. I just have one pick. The bird in #1 is under too much shadow. Time for the shadow/highlight adjustment tool.
I love the composition and DOF on the first one! I think you might have missed the focus on the bird ever so slightly though... but nice anyway!