You can maybe add a circle on top of your design where you would put all the necesseray material to build your waffle (like the picture of the yellow brick with "x 24" after...as what you see on instructions)
I love the idea of the list of "ingredients" too - you would have to move your design down though to put the list at the top. Otherwise it's great - makes me want to play with Legos while I'm eating a waffle....
hmm. I feel like it takes too long to get to the punch line.
Step 3 is redundant after you have step 2, and after step 5 you could have the completed waffle with syrup only covering half, to make sure what's under the syrup is visible.
Also, that way the images could maybe run larger, and perhaps in a zig zag down the entire front of the shirt.
I agree with bygrinstow, in that it runs a little long. I think you can accomplish the idea with just using images 1, 2, 6, and 7, without losing much if any hilarity of the idea. I'm not sure you need an ingredient list, I think the idea stands well by itself.
Of course, just an opinion. I'm not qualified to give you any definite pointers. :P
This might be kind of picky, but the syrup jar seems a bit small compared to the size of the lego and plate. And given how much syrup is on the lego waffle, I think the container should be emptier. These are just small fixes, though; I think you've got a great idea!
I don't have any designs or critiques up, but if you've got time, could you take a look at some of my slogans?