Okay, first of all those sketches look quite nice.
They're not super-precise though so you'd either have to make more detailled concepts and orthographic front-side drawings or allow your 3D modeller some artistic freedom when it comes to details, proportions etc.
But that's not the main thing I wanted to say. The main thing would be HOLY SHIT IS THAT A LOT OF WORK!
I mean let's sum up:
- 4 rigged and animated characters (those take huuuuuuuuge amounts of time)
- 1 non-animated character (the angel statue)
- 1 additional character head (for the serpentine statue on the "Closer to Heaven" pic - I'm listing this separately because human faces are one of the most difficult things to model)
- at least 2 big, important environment pieces (Close to heaven - thing and the fountain)
- an arc/ arcade thing
- corridor elements/walls/floor
- a balcony of sorts
- several rocky formations with plant growth
- a window
- a symbol with a special door.
- the whole special puzzle room architecture (not quite sure what it looks like exactly, the drawing is a bit unclear there)
I don't want to burst your bubble, but... well, we will see who else replies to this thread. I, unfortunately, do not have the time to help out since I have little free time and this is just too much work... but I wish you the best of luck with your project.