The render and the screenshot of the viewport look very alike, hard to spot some difference. What do you feel needs improving? The lighting is good, the model looks very jagged and low poly. You could alter the composition, find a better camera angle. Try getting a little bit of depth of field if you can. Let some shadows in, so you get some gradient in your shoe. The shadows it’s casting only by the lights is very harsh, you could make the radius bigger so you get some soft shadows.
