Black Rock Shooter

Finally, my first Black Rock Shooter fanart
The sketch was done more than a month ago but I was so busy with school and concert that I really didn't have time to colour it.

I'm kinda happy with the way the background turned out, especially due to the textures.
It took me forever to do the chains and tiles since I did them manually, tracing from the sketch.
Can anyone teach me how to make perspective (like the floor here) digitally with SAI or photoshop?

I can't wait to watch BRS OVA


Comments are greatly appreciated


Black Rock Shooter (c)