>I set it to General field type.
>How can I reference a path of a bitmap though?

I would recommend to store the pictures in certain directory in your application directory structure. It can be in application path, or you may select the proper path in your system configuration setup. Also you may store the full path to the picture obtained with GETFILE() function when you add the new record. You will just point to and pick the appropiate picture.
I would not use GENERAL field. You will not really gain anything in storage size, bur rather loose, as Hilmar noticed. You might just get more problems later when you, for example, will need to extract pictures from the General field or manipulate them somehow.