Think of lots of ideas you would like to draw and decide if you want to fill the space with colour just like a photo.
Another idea is to take a strip or corner of a photo taken and you create the rest of the scene.
Visits to the beach, zoo, playground, your favourite hiking spot, or even looking out the window of a car or train all work well.
A third idea, for more of a challenge, is to take a more symmetrical image and draw the missing half. You could use a silly face photo to make the image even more interesting to draw but completing a more typical self-portrait works well too,