Lightning Over Houston

This is my first post in this forum, mainly because I usually work pretty hard to keep the hand of man out of my images, but this is a shot I captured on a spectacular evening standing on my balcony in a high rise apartment building in downtown Houston. That's Discovery Green Park in the foreground and the George R Brown Convention Center in the BG. This is a 30 second exposure with a 5DMk2 - comments and critiques greatly appreciated.