Very cute. Wish it all was in a little sharper focus. Looks like a flash was used so it was taken when it was darker. you can use a flash during the day also - give you light in those hard to reach places like inside a birdhouse. Good luck in the challenge!
i see some wild possibilities for this composition. Mostly involving getting real close to the hole...but that wouldn't be very cool for mom with the flash. so it leaves a bit to be desired. the artifacts around the bird are tough. the perch is uncomfortably out of focus and the excrement is a bit unsightly-4
The lines in the bird house look nice and horizontal, good job on that! It looks as though the bird inside the house has maybe been oversharpened a bit. I think this was likely a difficult shot to get to focus the way you would have liked. The colors look good and the lighting is good as well. I like the composition.