Think the lack of contrasts, as already mentioned, is the biggest issue.
Another thing is the lighting. In the original version the light is coming from, what I can tell, the front. This isn t a very interesting lighting in my experience and makes the image less interesting than it could be. (In my version it s coming roughly from the top right)
To demonstrate the points, I whipped up this modified version based on Bens:

Original:

Another thing is the lighting. In the original version the light is coming from, what I can tell, the front. This isn t a very interesting lighting in my experience and makes the image less interesting than it could be. (In my version it s coming roughly from the top right)
To demonstrate the points, I whipped up this modified version based on Bens:

Original:
