What looks good on your screen will not necessarily look good printed. But not all. When you create a picture you will want to follow the guidelines presented in the product designer, specific to each product. For the most part, pictures should be between 150 and 300 DPI to print well on the products you can sell. Where this setting is located varies with different image software, but they should all have a 1-100 compression factor that you can set.
Lower compression means less distortion.
All rights reserved.