So I drew up headshots of the four dragon sisters (at least one of which is a regular in an rp channel i frequent).

Note: This particular dragon family (like many others I imagine) ages very slowly after initial puberty (which usually occurs between 13-16), so their ages may not reflect their appearances. The Thatcher dragon family typically lives for 1000 years or so, though in some instances (well, one really), they may live much longer.

Methlayne Hakkikt Thatcher: Age: 165, Height: 6', Weight: ~160lbs, Preference: Guys.
Mother to a german shepherdess who's since moved on with her life (she's now 22). Strong maternal instincts and treats her close friends as if they were her own children. Often times is sporadic and archaic, rarely acting in a predictable pattern. Has four other forms: German shepherdess (6'), feral furdragon (20' at the shoulders, some mammalian features like breasts), traditional scaled dragon (30' at the shoulders, no mammalian features), and the death wyvern (8', looks like the death wyvern from Hexen.)

Steph & Annie Roals Thatcher: Age: 45, Height: 20', Weight: a lot, Preference: Everyone.
Giant by birth and a hydra of sorts. They both share one body. They do not have any shape or sizeshifting ability; often bickers with each other over everything. Friendly and outgoing, though a bit clumsy. Each head has control over the body and seems to take turns; sometimes one may control half the body while the other controls the other half.

Stacy Davies Thatcher: Age: 27, Height: 8' to 50'. Weight: 700lbs-85tons, Preference: Undecided, though friendly.
The youngest sister and (as far as proportions goes) the largest. She does have some size-shifting ability, up to 50 feet in height. Can be aggressively affectionate and playful. Has a thing for banana splits.