best way to add image to a contact in the 7250i ?

Hello,

I plan to add an image to each contact in my Contacts of the nokia
7250i

What is the size of the image i should create in order to get best
results and save space so i can put images to all contacts?

Given a .jpg or .bmp file what is the best way to resize it and link
it to a contact in the 7250i ?

Use graphics softwares to cut and resize pic? what format, file type
and size i should use?

To transfer the pic into the 7250i, which software best to use? PC
Suite 5.16?

Thanks,

Mario