Okay, after looking at the shirt for a bit, here are my problems with it.
A) He's a monkey. There are two problems with this, one being that for the human evolution pun monkeys are a different branch of the primate tree, humans are apes. The other being that while there are monkeys in the game, that's not really how they look (all hunched up)
B) Not enough was done to sell the "Cave-Link" idea. This looks like you took Link and zapped him with a devolution ray or dressed a monkey up in Link's clothing. It would have been much better if you had, for example, used the wooden shield, made the graphics on them more cave-painting-y, had him wielding a club with the classic Master Sword hilt, and had him in a green loincloth.
C) There is something just off about the style. It looks like it was based on Gabe's art style from Penny Arcade. Not a bad thing on its own, but it lacks something in a shirt design, depth, something.
D) The ocarina. Why is it hovering? WHY!?
E) And my final complaint, green on green. Never do the primary color of your piece on a background of the same color. Especially with your "Fig. 1" joke in there, this should have been printed on something more like a cream or other like color to represent paper.
Sorry if I come off overly critical here, just hoping this helps you on subsequent shirts.
Wish you success in the future!
(Oh, and write-up guys, "From whence" is grammatically incorrect. It's just "Whence.")