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Just change your pictures aspect via the tv remote. I do this all the time from a Dell laptop to a 42 inch Plasma. The VGA has a resolution limitation so you cannot make it bigger via the laptop.
You can connect to a USB portable drive ( check power if not run with external P/S ), provided the drive is formatted in FAT32.
A link here gives some information. Sony: How to play MPG files on Sony Bravia - solution!
Manual will tell you files supported. Or you could use a 8gb Fat32 USB Memory stick
As another poster has said you could connect with a Server on PC wirelessly through router ( DLNA). Although I never could only with ethernet.