Here are a few of the "mock ups" I did for the Terminator Librarian as part of my Space Marine army commission. This guy is going to require a good bit of work, so I saved him for last.
Right now he's just "tacked" in place until I can get exactly what my friend wants and then I finalise the build.
He's still missing the Pre-Heresy shoulder pads and his base, but this gives you an idea of what I'm going for with the model. I still need to sculpt some cables on his chest and maybe find a way to make a shroud over his head like most Librarians have.
Of course he'll have a banner too, but that's another post.
My Project Link: Space Marines Commission
Additional related links:
Banners from cardstock
Basing your models with free stuff