It's pretty good, but a few things I'd working your lighting is a bit uneven, it appears as if you're only using only a single area light, thats works well enough but half the battle of any good render is lighting, I'd take a look at a few lighting tutorials to get your feet wet.
Also I'd add just slight bevel on the table, perfectly square coners don't exist in real life so add a slight bevel to a hard surface can make all the difference when trying to achieve a bit of realism.
Keep on practicing and nicely done.