I'm not entirely sure as to what you mean, but I believe this should help.

Code:
//declare image
yourImage : TDirectDrawSurface;

//in init procedure create 'n load surface
yourImage := TDirectDrawsurface.Create(DXDraw1.ddraw);
yourImage .LoadFromGraphic(DXImagelist1.items.items[1].picture.graphic);

//then in draw loop draw image
Dxdraw1.Surface.BltFast(0, 0, yourImage.clientrect,1, yourImage);
Note, BltFast wont work if your image is drawn partially offscreen!