It could seem a bit confusing to understand the consept of how to tell if its either Myra or Steph on the picture, 'cause I tend to mix them up, and for a reason often. They are two creatures sharing a body, and their mind is often like a split-personality that affects the body (changing to show who is in charge) but their features tend to get mixed up.

Steph is more like a half-dragon, being the more 'human' as she is the one ya could consider as 'the face behind the fursona'. But Steph would look quite alot like a 'slighly different identical twin' to Myra, having less of the common traits that, somehow, they can share even when the other is not 'in controle'

Myra is the all dragon, midnight-blue hide, razor-sharp teeth, venomous and tends to drip acid ^^' (from mouth and wounds alike). She has quite a few similarities to a raptor, mostly its her claws on her hind-feet...
She's playfull and smiles too much, easilly amused, without a care in the world and when angered: she begins to behave much like Steph, and you would hardly know if its either Steph or Myra if not for the features. You must hit just the right nerve to get her annoyed, and that is REALLY hard in the overall consept.

Steph is more observing, inverted and quiet, sarcastic and quite often unsympathetic towards others. She's just about as easilly annoyed as Myra is easilly amused. But staying angry is the hard-part, 'cause Myra tries her best to keep things in check (and vice versa). Anything that annoyed her today, will most likely be gone within hours. And sometimes, you could trigger a 'late irritation', when you do or say something that makes her think about it for a whole day, until she snaps and you would just be 'wtf!?' for the 'sudden and unexpecting' growls that should be a 'yesterday' thing.

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Small things that are identifying for;
Myra: Green eyes, Bladed tailtip
Steph: Brown eyes, no blade