You have some really nice work in there. I would focus the portfolio on your best models. The subway environment does not look as good as the models. If you're looking for professional work, I would reduce the subway page to a few of the best images, or consider eliminating that page completely.
Specific crits on the subway:
- As ZackF pointed out, there is too much contrast in the diffuse textures. I would consider reworking those textures for the portfolio, even if it doesn't match your course work.
- The walls and floors have some distortion in them, like some verts were moved slightly. Maybe that is supposed to represent damage or decay? It sort of looks like a rendering error or bad UVs in some shots.
-The square aspect ratio of the screenshots looks out of place, almost old school
Consider cropping them to the usual widescreen format.
For all pages, the videos should be at the bottom of the page, not the top. The videos are HD but the preview images are still low-res and make a terrible first impression.