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Photoshop would be ideal if it didn't cost so much. All I can say is try blending some of those harsh lines a bit with a small brush tool instead of a line tool. Other than that keep up the good work. (dont forget its all in the shading, shadows and highlights)
very creative, what program did you use?
If you want to make more realistic shadows and highlights, try downloading a program called gimp. It's free and also allows you to use dodge (for highlights) and burn (for shadows).