Actually I thought the original one was too light, this one looks spot on, the color of the hot dog is very close, the color of the bun could be a bit more brown I think.
If its the shading youre asking about, it looks good as far as the vertical goes, but ZT has the light source coming from the right no matter which way the map is rotated, so you may want to lighten the right side of all four rotation images a bit.
You were asking if it looked too plain, and it does a little, perhaps add a squiggly line of mustard down the hot dog, maybe a little relish and a couple chunks of diced onion here and there?