The lights are on
Let's face it...Yoshi was never too intimidating to the inhabitants of the Mushroom Kingdom. Sure, you want to step out of his way if he's coming through after eating a yellow or red shell, but on the whole he's pretty tame. And Shy Guy? That dude is harmless. They can't even take a stupid turnip to the face, even if they have one of those cool masks that shoots metal balls.
Apparently deviantART user ~7734-01 thought the two deserved to look a little more formidable, and the above art is the result. Just look at how much sweeter Shy Guy is...he looks like god**** Boba Fett.