|I am new to this, so forgive please! I would rate this 5.5 - 5.9. It would be a 6.5 or 7 but for the missed opportunity to capture the full extent of the moon. The birds, limbs, focus, composition, color and contrast are all really beautiful in this. But the moon could have (IMH)) been caught in a second layer, with lower ISO, faster shutter speed and an F number between 3.2 and 5.6. I might have also increased the contrast a bit because there is also some missed opportunity in too much uniformity (again only my opinion!) in the blue's and that could have really been exploited.
Otherwise, I really like this picture a lot, and thanks for sharing.