How to quickly create a cool design for a T-shirt?
Choose an original gradient. It will be optimal to choose a gradient of two colors. Colors should be different in tone: for example, dark-blue and blue. Or gradient can be relative with object.
And you can add a small shadow without blurring. If you plane print on gray T-shirt.
It’s the basis. At the next stage, you can add abrasions, unevenness.