Hey Spencer,
I'll mess with my original post a few more times and give you a few more versions. As far all 11, 12, 25, those are pretty neat designs and by no means am I down talking that talented artists work. But from a screen printers perspective they are too faint in my opinion. I think it would not look good if you decided to go with black T's in the future.
#11 looks washed out,
#12 the orange doesnt really flow with the " to pretty to eat " theme and
#25 if you look at the cake edges they look hazed out which in screen printing will end up looking washed out as well not giving it those defined lines. #27 the gray is too light and if printed on white shirts will be barely visable and if printed on black shirts the black lettering would be white and conflict with the light grey if that makes sense. Again, just clarifying my opinions come from 10+ years of design applied screen printing and seeing you reference the screen printing aspect of it I'm just giving my input on that. I will be in my office Saturday morning from 9am-1pm pacific time. You can also reach me via cell tonight if you'd like till 10:00pm and I would be more then happy to pick your brain and throw out some more ideas. 916-308-0115