The difference between printing and real signatures: real signatures are all signed with a dedicated signature pen, which can be wiped with alcohol. The printed version is a replica, which cannot be wiped, and there is no sign on the surface.
3-inch small card size: approximately 8.6 * 5.4cm

6-inch photo size: approximately 10 * 15cm

12 inch poster size: approximately 30 * 21cm