Everything looks great except for the vase thingy. It has no shadow and the ambience is too high so it looks pasted on and like it's floating. Compositionally the necklace is well isolated but the position of the other objects (chair&clock) compete visually with the focal point. I suggest you try getting WAY closer to the jewel and let the scene be revealed in its reflection, that may or may not do something for you. Keep it up! -Madmax