The most important is high quality/resolution meaning with many visible details on the face (no blurred lines). If you choose to change the clothing for something with lower neckline, keep in mind that the neck should be visible on the photograph so that it would not need to be artificially added. The higher quality of the photo input, the higher quality of the final product.
We kindly ask you to send us the original photograph (not reproductions if possible) and please do not staple them. We will send you the original photo back. We use it just to scan it with high resolution on professional scanners.
Computer print-outs are mostly not suitable for photoceramic production. You can use prints to show changes or mark things and use it as a template.