learning light and shadow

you might have noticed that i've kinda been working in black and white or with a coloured texture over black and white recently. this is part of my plan to get better at light and shadows. so here are some studies of how light effect spherical objects. the first one is defiantly wrong. oh and just so you know no refs used. all done from saying oh the light source is here so it would look like this.

i also bought a tutorial video from gnomon workshop that is about the tonal female portrait to help me improve there. its been quite an enjoyable watch so far... though he needs to touch on the basics before diving right in. so you will hopefully see some portrait studies from me in the future.