looks good really, so far as I can see there is only 2 things I can think of to note

1. as lovely as it is showing his soul crystal, he usually don't sit on his "throne" topless, he usually wears his coat ^^

2. might just be me but the hose on the bodyguards gas mask seams to narrow down to a point, if so it´s not suppose to, it´s suppose to go a length then cut of bluntly.

otherwise I cant see anything major to note, at least not on the sketch phase.

I understand. :3
The hose is an easy fix.
The only caution I have for you on the jacket is it's a rather bulky clothing item. It could possibly cover up much of the detail of the chair that you wanted. I'll save a copy of both versions just in case. :3

well you dont need to follow the chair ref I gave ya blindly, if you need to make the chair, taller, wider etc to fit with the scene, do it ^^