Silhouette Practice (1st attempt)

Subject of the week: Dinosaur
Coming up with ideas this week for a creature based on Dinos, or I guess just large reptiles in general.

My idea today was a Bipedal Creature.
Some sort of spikes following along its spine.
Large feet (like a Kangaroo).
Large tail (like a Kangaroo).
Horns (like a Bull or Triceratops).

Then I came up with some head variations. In order from top left to bottom right.

THIN: Thinner skull, hornless. W/FUR: Same structure, but covered in long fur, with a mohawk style
LONG EARS: Replace top horns with long, pointy ears and small horns going downwards out of jawline.
W/FUR: Same structure, but a large mane of hair possibly concealing most of the head.
HEAVY: Smaller top horns, more girth, and Large spikes coming up way higher on the skull before, making the skull look much smaller.
W/FUR: Short fur spread across the jawline, like a beard.

Two tail variations.

MORNINGSTAR: A large bulb of bone with large points portruding, to serve as a defensive device.
JAGGED: Self explanatory. Slime, yet heavily teethed with both a layer of small and large points.

Then I put some spinal spike patterns.

ELONGATED: Converting the spikes along its spine to a fewer, yet much larger pattern of spikes. These spikes would be smoother, sharper, and taller.
BIG/LITTLE: Convert the spikes along it spine to smaller, more frequent pattern of spikes. This set would be much thicker, and bulgy, actually slightly stretching along the ribcage a bit.