Would I be able to use a photo instead of an emoji to identify my AirTags?

As of now, Apple does not support using photos as custom images for AirTags directly. Instead, you're limited to using the emojis provided by Apple during the initial setup. However, you can personalize your AirTag using a creative workaround involving either custom engraving (when ordering one) or by applying a sticker. Of course, neither of those would affect what you see in the Find My app.