High quality images will reproduce best (at least 300dpi, and min size 475 x 475 pixels). The person’s face should face forward so when added it appears they are looking out from the helmet.
Ensure that you have permission to use the person’s image that you send. I will trust that permission is agreed as I cannot take any responsibility for images provided to incorporate into digital art pieces. Please do not use copyrighted images. Any images regarded as inappropriate will be rejected.