Wow. The detail you managed to put in this with just one dollar bill is really amazing, especially the legs and tail. I know I'm not the first person to ask this, but if you have time could you maybe put up a tutorial showing how you make one of these?
I've been doing origami for about 8 years on and off
(I'm 12) most of my stuff I do from books and I have a few original designs... (I made a variation of the waterbomb from an 8.5 x 11 sheet that looks like a durian...)
But to see your works, not just this one in general, is simply amazing. I'm guessing most of these are a tad... smaller compared to how big most of them seem in the pictures. But... you must have some crazy skills and precision!