Making a correct moodboard doesn’t mean compiling a collage of Pinterest images. Sometimes you’ll need to search for the digital pointings of the objects you’re planning to draw. If it is a Victorian-age street, for example, you may need information about the typical height of walls of those times, door width, types of ciphers, wall textures, etc.
Moodboard usually includes up to 10 references. Don’t follow “the more, the better” rule here. It’s much wiser to prioritize research. Read on the subject and embrace its peculiarities instead of simply googling images.
If you don’t find digital and structural pointings first, the outcome will suffer in the end. The resulting illustration is likely to be flat, non-convincing, static, and dull. At the same time, it may still remain quite appealing.