Very overexposed. You must have lots of this comment until now. But I really understand that you tryed to isolate hands in a pure white background. Ok if you taken down the curves in PS you can get a more pleasant picture. Other issue is the yellow light in the edges and over the fingers of right hand. It suggests a direct sunlight or other warm light source. You need to gain full control of you light to take these kind of picture. Using light of same type is recomended. I know this is hard to take, but it´s our fun.
Neat, and meaning full, this would have been better if the person's hand on the right was displayed in the same fashion as the hand on the left, as in, the hand should have the pinky at the bottom, and the thumb on the top.