for one thing, theres no depth of field. Heres a trick I use in photoshop; go into quick mask mode, select the gradient tool with black/white as foreground background and use the foreground to transparent gradient. Execute the gradient fill from top to bottom in quick mask mode. Then exit quick mask mode and perform a gaussian blur with a setting of 4. You will get a gradual blur that simulates how depth of field is seen by the human eye.