Simple Rare Death Lizard Ref.
That is a female in the reference. Females have softer features, so if you were making a male, they would be slighter boxier and rough. They can heat up streaks along their bodies and have a whip-like tail with soft spikes that can still inflict damage on anything with a low scale density or none at all. A full grown male is about 7 tons while a female is 8.