Took original picture and with the wand and lasso tool, selected the part that looked like a lizard to me.
step 2 of 6
With the part selected I changed the hue and saturation. Made it green
step 3 of 6
With the part still selected I filled it with green and set it to screen.
step 4 of 6
I burned a few places on the green shape layer to give it a little more dimension.
step 5 of 6
I made the eye. I used the shape tool and made a black shape then I made a yellow shape, last I made another black shape. I put on some FX and used the burn and dodge tool. I warped it to fit better.
step 6 of 6
Last but not least, I used the pen tool and made the tongue. I used the warp to get it to fit and the burn and dodge to get light. The End.