I had a lot of fun doing these. I don’t think they’re the greatest but they do the job.
For my monochromatic piece I decided to use blue since it’s probably my favorite color. 
For the complementary colors I chose Blue and Orange. I wanted to make the differences very stark and dramatic. So I chose to use the blue for the shadows, the white of the paper for the mid tones and the orange as the highlights.
For my split complementary piece I chose the yellow-orange, violet and blue. I really like the how the colors came out in the piece, they have a muted tone that I really like.
And finally for my triadic piece I just chose the primary colors and made a design for the robe thingy she’s wearing.
I really like how subtle the colors were in all of your pictures; it made them really harmonious and work well despite the combination you used. I really liked your monochrome portrait- the shading of blue is really nicely done! I also really like the split complimentary portrait. Your color choice was perfect- it looks really natural. Great work!
I really love your work, the colors always add to the pieces and that is one of the hardest things for me to grasp. I think you are a master of color.