good, good, keep going. Try making lines that denote the perimeter a little thicker and darker. Any line you can “tuck your hand behind”. Also, try making your cross hatches a little closer together/more of them and let them go slightly beyond the perimeter of the shadows line (note Jeff;s sketch above with that. Let your lines go past where they intersect with other lines. Lastly, try incorporating some thick to thin lines. The thick to thins really draw the eye into the sketch.