Take a look to LoadImage function help at MSDN Library. Also you can see winuser.h header file from C:\program files\microsoft visual studio\vc98\includes. In this file are all possibles values for this argument.
16+4096 = LR_LOADFROMFILE + LR_LOADMAP3DCOLORS

#define LR_DEFAULTCOLOR 0x0000
#define LR_MONOCHROME 0x0001
#define LR_COLOR 0x0002
#define LR_COPYRETURNORG 0x0004
#define LR_COPYDELETEORG 0x0008
#define LR_LOADFROMFILE 0x0010
#define LR_LOADTRANSPARENT 0x0020
#define LR_DEFAULTSIZE 0x0040
#define LR_VGACOLOR 0x0080
#define LR_LOADMAP3DCOLORS 0x1000
#define LR_CREATEDIBSECTION 0x2000
#define LR_COPYFROMRESOURCE 0x4000
#define LR_SHARED 0x8000

If you want to change the size of pictures, you must change the 4th and 5th parameter of LoadImage (width and height).

Hope this help.
Esteban