product sketch and idea generation platforms by Andrew Loh, via Behance
sketches by Michał Markiewicz
sketches vol.1 by Michał Markiewicz, via Behance
power tools industrial design - Google Search
Google Image Result for http://www.academyartonline.com/lp/assets/online-classes/assets/two_class_samples/modules/ids630_09/m09_media/session_07_clip_image002_0000.jpg
My Sketchbook (Sketch pile) 2015 - part 3 on Behance
Carl Liu, his work is amazing. These sketches are a brilliant example of form, fluidity, colour, highlight, texture and complexity.