The texture of the buildings is amazingly done. I especially love the shadows on the eaves and the reflections in the windows, they add a whole new level of realism to the picture. That the colors of the buildings grow lighter as they appear farther away from the viewpoint adds so much depth as well. This plus the beautifully blended colors of the sky, just make the drawing seem real, even though its clearly not a photograph. I don't pretend to be an art critic, but all the same, this is flawless. By contrast, Kiki's colors are much stronger than the background, its easy to see that she was added later. It gives a feeling that Kiki is farther 'forward' than the buildings, rather than higher up in the sky like the birds. Not a bad thing, it makes her noticeable, and she is the focus after all. But its a break in the artfully blended light scheme you have going, almost like she's a stamp (though wonderfully drawn all the same). I think she could be blended into the sky better. Though, Whether you like the way that Kiki pops out of the picture or not is more personal preference than anything, and its the only thing I can say about this picture that isn't downright amazing. Did I mention that I love the black cat sitting on the chimney? Let me end this by saying that this work is much better than anything I could draw, but you asked for a critique, so this is my honest opinion. Probably one of the best drawings I've ever seen. Period. Hell I made an account just to review this drawing.