AHHH I love love love the first one! He is so cute! And the evil cupcake's ink is GORGEOUS!
What brand of ink are you using? I have a silver ink I use but it doesn't hold up well to washing. =(
I used Speedball screen printing ink for the first shirt (that stuff is amazing!) and Tulip Metallic "Soft fabric paint" for the second. I'm sure they have it in silver, too.
Hope that helps!