Next series of sketches.
There is a particular shot which I planned to have 2 birds standing on a cable against an evening sky. So I proceeded to model this bird, which pretty much takes only a day to complete.
Since the shot does not require details and the birds are likely to be silhouetted, I just spent most of the time getting a silhouette which I like. I started with getting reference, then creating a base mesh in Maya, and finally a little touch up in ZBrush.