Old Reference http://pirateking-hightide.tumblr.com/tagged/tidereference
Sharkpony http://pirateking-hightide.tumblr.com/tagged/shark
 
Beside the normal reference, there is a picture of High Tide in his sharkpony form. He's a bit more taller, but notably he's longer now, mostly from his tail but also as if his torso was stretched a tiny bit. Beside High Tide's normal picture, a little drawing of pointed teeth would be nice.
 
All around the reference, notes written down for the viewer to see.
"High Tide can be drawn with a ponytail and some facial hair, and even 'Gary Oak' hair."
"Even in his plain unicorn form, Tide has pointed teeth."
"Tide is almost always grinning!"