Photo updates on Facebook and other social media get more likes and shares than regular posts. Adding images to your social media campaign is a great idea.
The one main thing to watch out for when posting images to Facebook for mobile; be sure to have the image dimensions correct. Once posted, in the users mobile phone feed an image too large will be cropped and the user will have to click on the image to see the crop sides on a mobile device.
Refer to the below infographic courtesy of Jon Loomer for a Facebook image sizing cheat sheet for Mobile and Desktop: