Make sure you open the correct skin with the .SKIN extension (and not .SKIN7) in Resource Hacker. Because the files in C:\Program Files\Classic Shell\Skins are UAC-protected, copy them to some other folder like the Desktop, rename the skin that you are using and then open it in Resource Hacker. If you edit them in place inside C:\Program Files\Classic Shell\Skins with Resource Hacker, the saved changes may not be saved unless Resource Hacker is running as administrator.
Here is a snippet from the "User Picture (Classic Skins)" section of the Skin tutorial at
http://www.classicshell.net/tutorials/skintutorial.html The start menu can also show the user picture. You enable it by setting the size of the user picture. All original skins use 48x48 pixels, but you can choose any size up to 128x128:
User_image_size=48
You must also set the position of the image inside the menu:
User_frame_position=-10,6
Positive position is measured from the left and top, and negative numbers are from the right and the bottom. So "-10,6" means 10 pixels from the right and 6 pixels from the top. The horizontal position can also be "center", "center1" or "center2". Then the image will be centered over the whole menu, or over the first column, or over the second column:
User_frame_position=center2,6 - center on top of the second column
Optionally, you can specify a frame bitmap:
User_bitmap=12 - the resource ID of the frame bitmap
User_image_offset=8,8 - how many pixels between the top/left corner of the frame and the top/left corner of the user picture
The frame is drawn on top of the user picture, so it must have a hole where the picture is supposed to be. That means the frame bitmap must have alpha channel.
By default the user picture is drawn opaque. You can control the transparency of the picture with this property:
User_image_alpha=200 - set the transparency to 200 (out of 255)