Here's my Christmas critique because I can't stop looking at this watercolor.
What I like:
The subject matter: Not many people talk about sleepwalking these days, least of all supernatural beings sleepwalking. You get full marks for originality and creativity, for I'd never imagine an angel suffering from somnambulism.
The birds- they're solid, rendered figures with accurate gesture, and established in the foreground. Their presence also reminds us of the angel's otherworldly appearance.
What to think about:
The background clouds- I'm nitpicking here, but this is one case where lighter washes do not help background clarity. The angel is standing on something rather than floating because his wings are stiff in contrast to the dynamic birds. If he's flying, then show the wings in motion rather than standing still, and if he's standing then create a form of ground for him to stand on.
Also, think about lighting; the angel's shadows are different from those of the clouds, so he seems to be pasted in front of a background. Make sure that the shading is consistent, and you should be good to go.
Happy Christmas. Paint more watercolors from above!