One of my sidelines is sublimation printing also but mainly for company/business promotion, l sell a few ready made items just to keep the printer heads primed up.

Using other people's images is usually a no no unless you have their written permission. There are some web sites that have royalty free images but not photos of pop stars (l don't know what you call singers now a days but 'pop stars' will do).

l watched a local print shop get fined big big $$ for printing a tee shirt with a photo that was taken by a pro (and not paid for).

l watched a vinyl cutting mob close down because they started selling the My Family stickers and got caught.

If you didn't take the image, or don't have written permission to use an image - don't use it or sell it.

If the company (who own the One Direction rights) wanted to get all legal on you, you'd be toast sad to say.

I know 'everybody else is doing it' but they aren't the ones who get caught!