Grimstonefire:
Welcome to the forum!
You might want to take a look at the hellcannon at the bottom of the list of thumbnails. It’s got cool green resin pouring out like slime.
https://discourse.chaos-dwarfs.com/t/5528
I think your one could be improved with some green washes all over. Perhaps water it down a little at first so you can see how heavy to do it. It would help to tie together everything better IMO.