What do you see? Don’t stop with your first response. Keep looking. Expand your eyes as you open your mind. Do not be afraid of any thoughts or emotions that coming along. Do not judge them. Just let them happen and observe. Now, erase your mind and flip the image, and do it again.
This is actually a great life-skill to learn. Not just for looking at art, but in how we observe and interact with life; in how we hold our judgments and prejudices based on what we think should be there. Practice looking with an open mind and without expectation.