Hey !
This a good start !
The overall design remind me a lot of Plague, in Dead by Daylight.
I love the design of your propositions in the right, but I preferred them without her left arm, it make less sense with it I guess and that was cool for the demon theme
For the colour I guess the coral one could be the best, because in the ancient Egypt, the blue was a colour associated with the magic and the domain of gods, this could be a nice thing.
Also I guess keep her straight human/water is sufficient for the design and the Egypt theme, I don't think it need to have more complexity. Straight and simple is often the best way.
And I've spoken too much I'm sorry. That's very cool, keep up !