Nice texture - almost looks like leather. wish you could have included the bottom vein, and made the light a bit less glaring - it is distracting of=n the left.
Some beautiful detail and the lighting is really bringing out the map of veins. Not so keen on the misty quality of the upper left area and upper right tip.
I love sepia, and I love when photographers are unafraid to get close to their subject matter. I can't stress enough how bold it is of you to decide how you want us [the viewers] to see the picture, and not let us decide how you should take the picture.