Some Arting Advice.

Don't use white for tears. Real tears are transparent, and long trails of tears don't equal deep emotion, utilize facial expression and body posture.

Study proportion, torsos too short, hands too small, etc, throw a viewer off. An easy way to see if your drawing is in proportion is to flip the image, or the old-school method, look at it in a mirror.

Don't rush to finish, ie: spend all your time on texture and detail before you've worked out the design. All the colour and texture in the world won't save a picture that's badly drafted.

BACKGROUNDS - use them. These ground a figure in it's space, if you don't define a background, define the borders, sharpening the design so the work doesn't float (or look unfinished, like student work)

Use photos only as reference, as a starting point, tracing over images does not teach you how to see and then render an image with emotion or a unique style, so that when people see your work it stands out because it expresses not only the character but the artist.

How are Angels different on Supernatural?

to put it succinctly, Angels Are Dicks. They appear in the SPN universe to further their own ends, mainly, to hasten the Apocalypse, destroying half the planet in the process because God is Dead (or Missing) and they are all unsupervised children, a large amount who hate the 'mud-monkeys' read humans, that their Father charged them to love and protect.

see, I can get behind that. (because it's interesting)

The main angel character on the show is Castiel, who is modeled after the angels Damiel and Cassiel in the classic German film Wings of Desire and physically modeled after the character in the graphic novel Constantine (trench coat)

The interesting arc of Cas' character (nickname given by Dean Winchester) is that initially he comes on as an unfeeling creature with no free will who slowly becomes more human under the influence of Dean and his brother Sam, but the fall downward is messy and filled with anger and fear. Dean Winchester, who is a great dichotomy of macho-posturing yet the most nurturing male character I've seen on television, becomes like older brother to this incredibly powerful creature.