Magellan's Redesign - wonderful look at process! I need to improve on my graphics and this would be a great start!
Design Journal: DesComm Chair project
beautiful bottle sketches by Jonathan Osborne
industrial sketching! i just loooove this kind of sketch :D
rendering - markers
Children's play structure sketches, I like the pops of color to bring attention to certain concepts.
sketches vol.1 by Michał Markiewicz, via Behance.
Sketches on Behance
Sketches we like / Marker Sketch / Digital Touchup / Earbuds / at NOIR on Behance
Design Sketchbook II on Behance