Screenprints (Conversation II III)

I am happy with this prints. I like the way my subject and background engaged each other, and there is a interesting space between them. Moreover, I printed different colors. I usually print with color except black,
but in the bottom print, I printed with black in the beginning, then printed with white. I think this is very successful because my print seems to come out from the paper, and I feel the print is more painterly.
I always thought black is too strong for my art, but since I know how to layer colors, I would like to try using black.