This free app version of the popular Adobe Lightroom for photographers comes with a ton of options for quick mobile editing. Check out this short video series on using Adobe Lightroom for food photography.
Snapseed Android and iOS
Another free app which includes preset filters which you can use as-is or adjust with additional in-app tools. Access Lynda with your ACE account for some video tutorials on using Snapseed.
VSCO Android and iOS
Very easy to use with both presets and many additional tools. Access VSCO Journal and Collections to browse through community content for inspiration.