On the two recent occasions I was in Shanghai, I was thrilled by the abundance of candid street photography opportunities that presented themselves in its old neighborhoods. The narrow lanes crisscrossing these neighborhoods are called lòngtáng (弄堂) or alternatively, lilong (里弄), where whole communities live and sometimes work. The Shanghai lòngtáng can either refer to the lanes that its houses face onto, or to a group of houses connected by them. 
These two portraits are of elderly actors; the type that the cinematic world calls' "character actors" (these are generally defined as supporting actors who play unusual, interesting, or eccentric characters). I found these actors to be much more visually interesting than the glamorous divas; not because of their rugged and wrinkled physiognomies but because they had presence...and must've been part of these troupes for as long as they could remember.
In contrast with most of my peers, I seldom use Photoshop and have never used Lightroom. However, I rely on three post-processing/editing apps as my tools of choice...these are Color Efex Pro (originally of Google and now part of DxO Software, Iridient Developer (the raw image format processing software for macOS, and well known for its ability to process Fujifilm X-Trans raw files), and lastly ON1 Photo Raw ( a raw processor, photo editor and plug-in collection all in one).
Some libraries already have enough travel shots, but the big online stock libraries are always looking for fresh images, and want to offer as much as variety as possible. So, if you want to submit to a particular library, check you have a good range of high-quality images that are different from the library’s current selection (and as good as, or better!). Libraries will also take a cut of the money you make from selling your images, typically 50%.
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.
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