The Pigephant (Evolution of the Grub)

Someone left me a perfectly nice outline of an elephant in my Round 3 Moleskine, I assume as a collaboration, but I messed it up BIG TIME.  I'd never used oil pastels to speak of, so this was my first attempt, and I didn't really know what I was doing.

First try:

Pigephant (the grub)

My husband said it looked like a grub.  I was calling it a pigephant.  I decided the back legs were too far back.  I kept fiddling with it and finally had this:

King Tut-tut

I decided his trunk was too short.  (?)  I made it longer.  I moved the tusks (but couldn't quite hide where the old one was.  I also moved the eye.

King Pink

So here is the maybe final version, in my round 3 book, a collaboration.  It may still need more work.  Can anyone tell me how to preserve it when I finish?  Can I spray it with fixative?  Will fixative stick?  Do oil pastels ruin the paper?  I didn't put it on the scanner for fear the messy stuff would ruin the scanner.

I am sorry to say I haven't had a chance, with the wedding et al, to post about my returned round 3 Moley. Sometime relatively soon, I hope.