Nice colours. I like Lisbon but last time I was there I had my camera stolen while I was enjoying a glass of port sitting at a cafe in one of the big squares! Bastards. I chased after them. Found my bag dumped in a bin but no camera.
Nice shot. When I am sitting anywhere with a camera bag I always loop the strap under either a chair or table leg. At the very least I put my foot through the strap.