Ah, yes, that is a little easier for me to see, though still on the small side. Here's what I'm thinking...
I like what you have to say in the paragraph, but to me it seems a little long-winded for a concept sheet. Maybe you could try a slightly more concise version, something like this:
"Two enemies, conflicting forces bound together through nefarious magic, have been chained to the confines of specially constructed silver armor. The result was a champion with their combined strength, both dragon and human. But such power was not meant to be trifled with--now Zarlfion exacts vengeance on his jailers with an elusive mix of a knight's discipline and a dragon's bestial chaos."
Then the type could be bigger and the paragraph would stay roughly the same size as it is now.
Anyway, that's my two cents! No pressure whatsoever.