Mark Anthony talks about what all it takes to make and keep Google Mobile Search happy with your"mobile friendly" website.  

Load speed along with font and image size will make it more friendly and help keep yu on the top rankings for Google on Mobile Search

Over 60% of all searches are on a mobile device.  

Optimize Photos

Make banner ads and other nonessentials load faster

Don't make the mobile user work to see your content. Keep it clean and easy to read with larger text