a splash of color would be nice...... i know the black and white effect is to make your sig look dark but trust me you'd get a much better effect if you had a contrast in colors somewhere..... it's boring to see black and white sigs so put some light effects using a soft white brush to get the main focus of the sig(venom/spider man.... whatever) to stand out  and blacken the background so it doesn't cut across your render,.....