matt: it doen't use a HL sky, I made it myself on the top part of a new image and then placed the picture on top. The sky is meant to look like that of Ganymeade (moon of Jupiter).
crono: some useful tips there. I have seen some tutorials on drawing wings, however I found them quite late into colouring the picture, and I felt that it would be both difficult to draw them for the first time on pc, and I was also very near the deadline as it was that I felt some things couldn't be changed. I may touch up the picture a bit now that I have unlimited time, but I probably won't be changing the wings.
I've heard of non-photo blue before, I'll have to keep an eye out for that somewhere. My inking skills are a bit shaky though and I didn't trust myself (only messed about with inking pens so far) on the picture. So I just scanned in some reasonable rough pencil, went over it on PC with a blue colour, then changed the picture to 2 colours (blue and white), then changed the blue to back and the palette back to 16 million. I have tried scanning a pencilled sketch and then fixing it in NP and it took me hours, probably because of the limited tools. With an inked sketch there is still a lot of ugliness in the black and my method took very little time. Still, if the picture is really complex I'd probably try the PS method instead.
I'm not quite sure what vanishing points are. This picture was quite a step into the unknown, being my first attempt at perspective, serious CG and complex architecture. If you could explain vanishing points, I'd be grateful. I also wasn't quite sure about what you meant by 'fitting' and making the surroundings represent the emotion. I'm not sure if it's relevant, but the picture is meant to be about a girl who is sent forward 500 years into the future via time machine, and that she is just taking in her surroundings.
I was kind of hoping that downsizing the picture would help smooth out the lineart a bit. Would you recommend me using a low 'blur' for the picture to make the lineart smoother.
A huge thanks though for the input, it's much appreciated 
[addsig]