Dave,
Really nice job! You might want to add some dark washes to the sides and add some schmutz to the floor around the coal bin, forge, and anvil. My grandfather did some blacksmith work, and I recall that it was a pretty dirty business. The walls around the forge should be quite dark...maybe add some grimy/sooty black painted aluminum foil. Same thing for the stack.
Just some suggestions. It looks great.
Best wishes, Dave