The thumbnail certainly aroused my interest, it's interesting and original but i am no longer aroused. the greenery looks a bit cropped to the right, nice composition, like the fact that there's no text aswell
I think that you could make something a lot better if you work the design into the shirt, rather than pasting it down in the middle. Fore example: reallocate more greenery to the right of the post, and bleed it off the left (viewer's directions, not wearer's). With your arm going over some of the imagery on the left, the greenery would "grow across" the shirt.
Granted, this might present a printing problem. I'm not sure how close to the sides they can print.
I think that you could make something a lot better if you work the design into the shirt, rather than pasting it down in the middle. Fore example: reallocate more greenery to the right of the post, and bleed it off the left (viewer's directions, not wearer's). With your arm going over some of the imagery on the left, the greenery would "grow across" the shirt.
Granted, this might present a printing problem. I'm not sure how close to the sides they can print.