Look at the way that this edit contrasts the colors to form shape. Your highlights are being squished between the dark border large bulk of the high saturation upon your blue body.
This means that your highlights don't really show up to the eye without close inspection because it's being devoured by the colors around it rather than assisting in shape.
You also used solid lines and blocky shapes to form your dino. <--another factor that defeats your efforts for form.
Again the edit uses highlights from a defined light source to give the dinosaur a rounded shape. The colors aren't in a solid batch or a line. They are sort of subtly reaching around the body to give it both a bit of texture and shape.
Likewise, the underbelly applies a reverse of the same process using darker shades reaching up to show the rounded texture from below..