As an artist myself, I have this problem sometimes. So heres some ideas:
Break down your idea of what you like. If you like animals, then break that down to what are you favourite animals are. It's a matter of what you like and what you really want to draw. So possibly asking random people to just draw this or draw that wouldn't exactly be the best idea unless you wanted to a commission.
How I do it is simple, I was running out of idea to draw more fan-made animals of mine, and I was almost out of material to come up with more. What did I do? I researched! I looked up different animals of what I could draw, something my taste and could catch my eye instantly. And I found it. But then I also didn't want to make the animal plain and boring, instead I added some flare to it. No if you don't know what type of flare I'm talking about, I'm talking about mashing up things to create something amazing. You could use food, metals, elements, existing objects, animals, etc.