To start off I did a couple of of portraits with references from photos I have on my laptop just to try out different facial types.
I've decided I'd like the angel to do a lot of emoting through body language and use as little speech as possible, so after an afternoon I studied a favorite Mr. Bean sketch of mine to see how he used body language.
Because I want him to do a lot of acting through his hands and feet I figured it'd be prudent to sketch them too, references again were used - my own hands and feet, which is why there's only a right hand and no left - I can't draw with my right :P
Now, what are angels without wings, naturally the obvious thing to look at are birds, so here's a couple of birds for you. The first page is references from images again on my laptop and the later are real life geese in the park.