Yeah, getting inspiration is tough.
It kind of depends on the style you have but you can start with doodling first - you can take two random objects you see or think of and try to draw them interracting in some way. You can doodle anytime you have a little bit of downtime and it may inspire you to draw a bigger piece next time.
I don't know, just from top of my head right now... A zombie hand holding a snake for example. You get to practice a hand, rotten skin and meat, broken bones and actual snake that you can make look way more sinister as well.