This image is very flat and lifeless. The shading on the guys left arm doesn't make sense, it like it lit from below while the rest is lit from above. Also the girl's eyes have zero emotion to say nothing of her expression. It would seem to me that you as an artist are stuck in a comfort zone and not growing or truly experimenting. Take a drawing class, do some still life experiment with different media, do something outside of your norm, you'll thank yourself for it.