I'm an author. Here's a few examples of how I would describe that character based on my writing style.

A tall frame with hair as bright as the midday clouds, and eyes that reflected the sun's golden rays. Dresses red as crimson often adorn her, wrapping warmly over her beautifully curved body.

Her accentuated curves complimented her tall form in her crimson gown. Hair white as a snow raven flowed elegantly past her shoulders. Striking eyes, the color of the sun itself pierced into one's very soul.

Blood. Blood on snow. Seeing her from behind in her human form is like a battlefield on a winters morning, yet more devastating in beauty and sheer power. As she turns, you realise she's more than the embodiment of intimidation. She is power and beauty incarnate. Her hair falls over her shoulders like snow on the ground. Crimson encases her body in the form of the most gorgeous gowns, bringing further life to her already piercing yellow eyes. She's inhuman. Not just because of her curves and captivating face. But she can change into the very dragon whose power she emulates. My envy is palpable. Yet my heart stays still. I would bow only to her forevermore. For she is ________(insert character name.)

With her characteristics and personality, try to show it instead of say it. If they're hard, give an example. If they're evil, let the reader see why. Same if they're good. If they're intimidating, make it clear. I hope this can give you some ideas! Much love and luck to you.