StatBanana put together some really amazing high-quality images for Overwatch maps, created from almost 10,000 in-game screenshots. These screenshots were stitched together to make seriously huge, seriously high-quality map images. These maps can be used to create annotated screenshots, plans of attack, and much more.
Please note, StatBanana requests credit of their resources, and for their resources to be used only in free works: "We only ask that you not use them in any non-free works, that you not redistribute them unaltered, and that either the logo in the corner is kept, or that you include something to the effect of Overhead map courtesy of https://statbanana.com/ below the image or wherever it is most suitable."
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Want to hear about new resources? Suggest changes or updates? Berate me for writing or adding garbage? Come hang out in my Discord. It consists of a channel where I only post updates for this resource thing. It may eventually contain further channels. I don't really know how to work this thing oh god help I need an adult. "This thing" being social interaction, not Discord.