I love the music (although it seems oddly familiar). The Turtle and elephants were somwhat dark I thought. For people new to Discworld, this aspect should be made clear - that it's a world travelling through space on elephants and a turtle.
Also the rimflow could be a bit clearer. Currently it looks as if the sea just stops when it gets to the edge.
The Tower of Art looks very familiar - have you taken it from some other production, or is it your own design?
Sorry to be nit-picking, but you did ask.