In my game, I mean worldbuilding project... there's a thing called gravity, and gravity affects the weight of everything, and weight has to do with the damage one takes and deals to another, it also has to do with running speed and impact when collapsing on the ground from a fall or when running into a wall or someone who didn't move out of the way fast enough.
This is my sharkman, forgive me for the hands, still learning tridimensional design. the tail is 184 centimeters long and the sharkman is 202 centimeters tall, eyes at 175 centimeters of height, with probably 25 or 30 extra centimeters if the sharkman was standing with extended knees.
105 centimeters neck circumference
75 centimeters arm circumference
62 centimeters forearm circumference
147 centimeters leg circumference
100 centimeters foreleg circumference
141 centimeters tail circumference