The British Museum has an absolutely amazing collection. When looking at any large museum, it can be a little overwhelming. A good first step when using any museum’s site for research is to find the option to search their collections. You can search by specific names (if you are looking for a specific work) or by cultures (which can be more helpful for more general research). In the case of the British Museum, you can also search by artistic period (like the Renaissance). Depending on the museum, you may have to try a few different search strategies to get the exact results that you are looking for. The important thing is to have patience because museum truly has an amazingly complete collection, and your patience will be richly rewarded.
Website: The British Museum: Collections Search
Humanities Scholars 