What do you do in these situations? Find the best lighting. It could be flash, Strobe, LED or even natural lighting. You have to know the unique characteristics of each light source and train your eyes to foresee when and where the best lighting will happen, and then get yourself ready to press the shutter. Only once you can identify a good light source can your picture be defined as “gorgeous” and touch people’s hearts. 

CM Leung will tell you everything about this in an easy and understandable way.

More info - https://www.cmleunggallery.com/