A Tiny Chapel in a Square

This weekend I worked on this sketch of this strange little chapel, just a single room really, that we stumbled upon in a small square in Mexico City. I was fascinated by its age, which was extreme, and the lovely pink color; it had a kind of doll-house effect. Unfotunately it was locked and we couldn't go in. The surrounding neighborhood was relatively poor, but there were beautiful old Spanish buildings dating from the 1500s on every street.

I'm trying to develop a style for drawings like this: loose and energetic but fairly accurate. It's not easy. The perspective distortion on the edges here is mostly in the photograph, though, and even when I used Photoshop's perspective correction tool I wasn't satisfied so I removed it. But I like this better than if I drew the entire thing like an architectural rendering, with vanishing points. No matter what, it takes a long time; I'm trying to get faster. This is obviously from photographs; I never felt like Ihad sufficient time in Mexico to sit and draw - we were too interested in wandering and seeing what was around the next corner!

Here's the drawing without the color; I might like it better. What do you think?