The size of photos and logos which are uploaded to FIBA Organizer should not exceed 512 Kb and 600x600 pixels

The absolute minimum requirement for dimensions - 75x75 pix

It is highly recommended to use JPG format for players' and teams' photos, but PNG format for logos of the league and teams. 

To keep consistent information in FO, it is recommended to use same proportions for all images (e.g., 1:1 for logos and 1:1 or 3:4 for head-shots).