Corjack,
When I made ours last weekend, the lime green I used for the Mickey heads bled so that you couldn't really see the outline and tell that it was Mickey. I went and bought a bleach pen, and went around the outline---it worked like a charm! And it was a day later so the dye was already set pretty well. DH didn't think it would work but it did! I can try to post pics later........
I am also planning to make more shirts this weekend, and was thinking about using masking tape around the Mickey head outline instead of dental floss- I just did not have luck with the floss keeping the color from bleeding. Have fun, and I think your shirts look great!
Amy