Id like to have seen a bit more in the way of technique and functions used, my general photoshop knowledge is pretty rudimentary, i generally only use the most basic of functions, but i saw a few tools/functions that you used that look pretty usefull.
like what you did to work on the back, flipped the sides into the centre without breaking the layer, what did you use to do that?
I work in too many layers to make that doable, so i have to do it the long way round, but it still looks pretty usefull to know.
and the part where you removed the stiches, was that just erasing? if so, it looked very neat.
overall, i think your shading technique is a bit over done and contrasty, it can be simplified and improved on.
but the vid is decent, shows that it takes time and effort to achieve decent results.