I've just updated my free library of resources for mobile art and photography, adding a brand new section, Graphic Design and Visual Story Telling! I hope you enjoy it! 

2014 Guides and Tutorials for Mobile Art, Photography, 
Graphic Design and Visual Story Telling

• Getting Started With iPhone Photography

• 7 Essential Photo Apps
• Top Apps for Photo Effects, Filters and Post Processing
• Top Art Apps for Sketching, Painting and Applying Painterly Effects
• Best Design Apps