A suggestion: try for darker darks. I notice in some of your work that your darks/blacks don't get as dark as they could. Whether or not you want a dramatic effect, for example, darker and darker could work, but overall, try upping your contrast in places when necessary. For these storyboards here, I don't think they need to be super-dark, but some more contrast can up the spacial differentiation between the various characters and their background.
A suggestion: try for darker darks. I notice in some of your work that your darks/blacks don't get as dark as they could. Whether or not you want a dramatic effect, for example, darker and darker could work, but overall, try upping your contrast in places when necessary. For these storyboards here, I don't think they need to be super-dark, but some more contrast can up the spacial differentiation between the various characters and their background.