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@webde5igner If you’re referring to the business icon supplied by Google Maps, this is set to one colour and [this image itself] cannot be modified. You can create your own icon and set this in the main Setup tab as your business’s icon.
If you’re referring to all the reviewer avatars, then this can be set using a shortcode parameter – check for this under. For example: avatar="/wp-content/your-avatar.svg"
Examples of both of these are found in the Demo website.