I've been practicing with Maya a little more, and I managed to put together a half decent sci-fi cityscape, which I planned on using in photoshop to paint over, to get some nice shadows and realistic perspective etc... However I decided it would be clever to play around with the lighting, and now every time I come to render my work, it comes up totally black. I've tried resetting to default lighting, but it just ain't having it. Anyway, in the mean time I attempted to further my techniques in photoshop by trying out a little portrait work. I've never done this before, and it has showed me that using reference material is incredibly valuable when it comes to getting realistic lighting and shadow effects.