Strong Points:

• It was very wise for you to have put green as a background for the red figures. This is the opposite color on the color wheel known as the complementary color. When these are placed together side by side it gives a richer color tone.
• You have a nice entrance into your paining coming from the bottom right. The center of interest (the face of the right figure) pops out nicely.
• You have no repetition of lines, which is also good.
  
  

The image to the left is a close-up of an electronically enhanced copy, with the suggestions of the critiquers incorporated directly into the image.

Specific comments are below.

Areas to work on:

One little detail that would probably improve it just a tad. You see where the green lines almost touches the hair of the right figure? Somehow I would like to see some more breathing space. Look at my modification.

Additional comments:
Good work!