Content is at least as important as contrast, and lighting. For example, the cock fight is good but would have been better if you showed the cock's face and fierce and angry eyes. Shooting pictures of animal's from the back just doesn't do justice to the animal. You also have too much foreground that just draws the viewer's eyes away from the subject - the cock and spectators. Too much empty space on the right. Crop it out too. Also, if you added more of the spectators, their excitement, if you would catch it, would add too make this a more dynamic picture. Imagine how great your picture would be if you caught the cock turned around running toward the camera, fierce eyes and all, with spectators in the background showing their excitement and spirit as well. Otherwise the contrast and lighting on this picture is OK.