Hey Tom I'm guessing that you must be feeling really exhausted with all you have going on. Hang on in tHere though as it is paying off. You are looking more and more like the concept artist you want to be with every post.
I can't quite get my head around how to approach the gridded spheres but you have done a great job, I also really like the figure study, you have some really nice marks and tones and feeling in that one. I do see that the on the second master study the breast looks a little small and not full enough and the hand too large and slightly wrong angle. Could just be how you had photographed it though.
Any chance you can make it to the Official Conceptart.org workshop next year in London? Would be cool if you can as I think it's going to be a great opportunity to get to meet professionals from the industry and get some more feedback on your work and job opportunities.