Copying an Ancient Painting

This is a work in progress, and I will update the finished picture when it's ready.  I have this enlargement of an ancient Chinese painting as a background on my computer and my wife liked it enough to want a copy for our house.  The original is fairly damaged and I think it's a water color, so I'm doing mine as a water color.   The original is also deceptiveness full of intricate brush work, and I wonder how long it took to do the whole painting as this is only a small portion?  I'm learning much from doing this.