Size of image will be determined on size of shirt; mock photos are not accurate depictions Colors can vary on monitors from actual productIf you choose a black shirt and the text is black or main image is black, the image will be changed to either white text or the image will have a white border around it to make it more visible and not blend. We will make the judgement call on what will look best for your specific color shirt if we feel it will be hard to visualize