You can't define BMAPs in that way, you are getting confused with PANELS. BMAPs point to a single image file.

Load BMAPS > BMAP* my_bmap = "image.bmp";

To display the image you need to define a PANEL...

PANEL* my_pan =
{
pos_x=0;
pos_y=0;
layer=1
bmap = my_bmap;
flags = VISIBLE;
}