I used to write songs, i was like 6 though so i lost them all so no sorry
The answer would probably be the last one
Answer:
Probably the first thing that comes to my mind when I see that drawing is a cloud. Maybe draw a cloud and add details like shading or etc. Another idea that I have is a paw of a dog. I don't know, it's really up to you. I'm just stating what I would draw if I were you.