Should the text be in French? 

It's not an obligation. You can add it in English. But please focus too on the image. Thx!

Hi there.

Do you want the design to be submitted as a jpeg?

Does the design only have to be in one colour?

Yes please.

No, you can have several colors. But only one color for the tee-shirt (see the attachment) in my brief. Thx.

Thanx!