Like it dude! I like that you have chosen to make a charicature style dino rather than an acurate representation. If you are looking for any more reference regards tail spikes the following is a good place to look-albeit small-ish images>>https://abc.net.au/dinosaurs/fact_fil...gosaurus_4.htm

The walking with dinosaurs team made an awesome job at their creations and their images, along with others can be found at yahoo images.

Can't wait to see the next pics mate!
Good luck with it!