Strictly coming from a mechanical view. I think you should wait on using any of the 'tools' in photoshop. You should in my opinion concentrate on one thing, and that is drawing, and understanding what you're drawing. Don't use smudge, don't use brushes, just draw buildings, trees, and people, and animals. Do this for 6 months, it'll be hard, and then try this picture again. I bet you'll be ready for the smudge tool and other things then. If you can draw on paper, do it, if you have to do it digitally, try using a simple round brush with pressure sensitivity on, and use black on white. Trust me, if you do this you will thank me, good luck either way! Go learn!