I believe that the Frozen Flame does not have a static appearance.
It appears in a way that is based on what is expected of it.
The Dragonians depicted it as a spiky crystal shape.
Radical Dreamers shows it as a spiky crystal of a much different shape, and Serge understands it (on some subconscious level, having contacted it before) as a living thing, probably also understanding that it is strange and alien(in the sense of not normal), so it appears as a transforming flame shaped object with eyes.
How it appears is affected by how we perceive it.
The Flame has an effect on people, and people have an effect on It.
This is the truth.
This is what I believe... at least for now.
...but yeah, I knew about the eyes... They bug me. I don't like this depiction of the Flame at all.