Even if it's a bit overused by cosplay photographers, Sceaux is indeed a gorgeous place ^^
I saw the pics on Lyel's journal today, and I like them in general. You did a lot of different things on this shoot, different locations, different poses, different lenses (I wish I could afford that 85mm...), and that's an effort I always appreciate seeing ^^
The light is sometimes a bit too hard, but it works with the mood of the series so it's not much of a problem. For example this one :

Eyes half hidden in shadow would have been a problem with a lot of characters, but it fits Sebastian sooooo well ^^
From time to time I see small problems with composition, in this one particularly :

there's a bit too much empty space at the bottom of the image ; I'd try for a square format here, it would keep enough space around the character.
(and I'd bring in a little more contrast, but that's more my personal taste here).
But I really, really like Lyel's pose and expression here, so it's still one of my favorite shots of the set.