Understanding the anatomy of human hands makes it way more easy to draw them.
I am always starting with a rectangle as the basis (pic 1)  and adding the different parts of the fingers as thin ellipses (pic 2).

http://www.newslinq.com/skarp-laser-razor/

Interesting use of color to frame the hammer.

Use of tone to communicate the surfaces of the drill handle.

Nice use of white pencil to add highlights but I think the dark outline blends too much into the cast shadow and background.

Quick motion study with simple lines and shapes.

I like how the color was added quickly and evenly over the whole watch and then the form was delineated with shadows and highlights.

I feel its hard to stop drawing hands artistically

This is a quick fresh sketch of an automatic razor. This sketch has an appealing composition and is done in quick clean strokes.