It's not going to have its maximum value because there are missing pieces. It looks like it was originally a service for twelve. I see twelve large dinner plates but only eleven of the soup bowls. I cannot tell with the other dishes, there definitely doesn't look like twelve cups, the lid to the creamer is missing....
You have more information than anyone. I don't have a maker, a pattern name or number, nothing. With that information, you can go to Replacements.com and try to identify exactly what you have. They have THOUSANDS of patterns and at least dozens of makers in stock. I can tell you that what they charge for missing replacement pieces is many times what they would pay you for the same piece, and that for them to buy any pieces, they must be close to perfect. If you can identify what you have,m then you can search eBay sold items, not asking prices. You can look at active, for the purpose of tracking those items to see if they do sell and for how much.
China, like many household items, is dying out. Millennials have little interest in traditional household items, very few host formal dinners, and even folks of my age who grew up around it and have it ourselves, don't use it. Our lifestyles are geared toward informal and as little work as possible. Sets of china are a very hard sell these days. Quality used sets that would have brought $100 at a garage sale 25 years ago, people are walking past them at $20.