The phrase "richer picture" refers to having a more detailed or complete understanding of something. It means having more information or perspectives that provide a clearer and more comprehensive view. Full definition
By describing human nature in categories that apply to some, but not necessarily to all persons, a far richer picture of man emerges than by regarding only universal properties. (religion-online.org)
The diversity of not only the women, but also their writing styles and experiences, makes for a full, rich picture of motherhood. (soulemama.com)
Of course, you're not going to get rich picture Live tiles for the vast majority of apps, but Launcher 10's developers cleverly emulated the feel of Windows 10 Mobile where possible. (androidcentral.com)