mijn benen zijn gevallen?
"My legs have fallen?"
Please note that this text doesn't make any particular sense and does not provide enough details to generate a specific image. However, a more meaningful interpretation could be:
"I've fallen and hurt my legs."
So, a detailed and descriptive English version for a picture could be:
"A person is lying on the ground, seemingly in pain, clutching their legs which show visible signs of injury or distress."