The results of my first collaboration...

[-Dark-]

The line art is very good, but the shading could use some work. The feathered parts and the neck have a noticeable amount of pillow shading, and while i gather that the light source is from above, the underside of its body and front of its neck are no darker than its back (and back of the neck).
which doesn't make sense according to the light source.

also, the feathers that are extending towards the yellow wings are shaded like solid cylindrical objects rather than feathers.