I study storyboarding as well. But I found that although there were a lot of sources that told you what storyboarding was and how to do storyboarding, there were many fewer sources that analysed the reasons why you would draw one thing rather than another, that showed what you should change in your storyboard so as to evoke various feelings in the audience.
What I found useful for all that was a book by Francis Glebas called "Directing the Story: Professional storytelling and Storyboarding Techniques for Live Action and Animation.
I should add I have no connection with the man or the book.
Home Built in Coolermaster ATX case with GigabyteGA-Z170X-GAMING 7 MoBo, i7-6700 @ 3.4 Ghz, Asus GeForce GTX 970 Graphics Card, 32GbDDR4 RAM, twin HD monitors, Huion H610 Pro Graphics Tablet, Kinect v2, Win 1064 Bit OS