HERE'S MY PERSONAL BEST RESOURCES TO KNOW MORE ABOUT LIGHT AND SHADOWS, PLEEEAAAAASE CHECK THESE LINKS BEFORE ASKING ME STUFF I DIDN'T COVER:
[link]
[link]
[link] all three made by awesome 
And here's the link to get Andrew Loomis' books as a .PDF-file:
[link] okay enough with the caps...
MOAR TUTORIALS/GUIDES:
PIGMENTS AND PIXELS:
Part 1:[link]
Part 2: [link]
Part 3: [link]
MANGA to REALISTIC:
Part 1: [link]
Part 2: [link]
Part 3: [link]
Part 4: [link]
Part 5: [link]
Part 6: [link]
Part 7: [link]
Part 8: [link]
Part 9: [link]
Part 10: [link]
Part 11: [link]
Part 12: [link]
UNDERSTANDING ANATOMY:
Part 1: [link]
Part 2: [link]
Part 3: [link]
Part 4: [link]
Part 5: [link]And no sorry if I didn't cover "shading hair" and stuff like that, READ THE HAIR TUTORIAL ABOUT THE "LAYERS" AND DO THE THINKING YOURSELF!

:3
by the way, somehow, that 'smiley object' of yours looks really creepy to me 0.0
They helped me a lot.
Thanks for providing the link ^^
Ever since the art classes I've taken in college and high school, I've had a hard time mentally working my way around the concept of values.
I've always taken an object AND it's values as ONE thing...that's why it feels confusing. I suppose you can draw the same object and give it different light values, but that's hard to visualize mentally in art composition unless you have an adjustable light source.
Often times my friends say my work is rushed...and while I like things that are glossy (read: shiny)...sometimes there's too much gloss and it becomes unrealistic or has no depth to it...can you maybe give me some advice for "making your own compositions" in terms of value? Like, what limitations there are to light and what's considered "too much light" or "too much shadow" resulting in a flat surface?