Once a black image is created, I clicked on File> Add Layer(s) From File, and used the Quick Mask tool (yellow arrow on left) to "paint" a line around Gui Lian. The Quick Mask tool wasn't sufficiently precise in blacking out all of the targeted areas, so I also used the Masking Brush tool (red arrow) and went over these areas on complete the task....a task that took me no more than 12 minutes; well within my range of tolerance. I then pumped up the saturation using Iridium Developer tools...a task that took under a minute.
Make use of people to give your images life and scale. If the facade of a particular building appeals to you, the picture may be that much better if you show people walking in front of it. They will give it scale and also let viewers know what sorts of people live there, how they dress, and the like. An outdoor café may be more interesting crowded with people than empty.