I absolutely love the stark b&w and stick figures together. The style works best when you have strong diagonals and lots of dynamic in the composition. Won't work too well with symmetric and centred compositions.
I would probably use stronger perspective and lose the grayscale gradients as they seem like a compromise next to the bold b&w areas. You could try big halftone dots instead but since your panels are quite small I don't know how that would work.
Overall, I like the style a lot, so keep it up!