I did this on computer. I sculpted the landscape out of nothing, made a texture, painted it on, drew the clouds, lights and shadows, Made a surface map, applied the snow and bits of foliage, filled in the water, made the ripples, and then I rendered it. Made me feel like a God!

It was pretty hard, but then again, it's my first "complete" one. All in all, it took about an hour and a half to two hours. The water, lighting and shadows are the hardest.