PicsArt is the best editing app available fot android. Its features can match that of Photoshop in PC. You can make awesome pics , thumbnails, collages, background editing everything what you have in your mind.
It has some very amazing filters and bokehs.
Light flare effects are killer.
Concept wise it is significant competetor of photoshop touch.
It has all basic features to be used by an ordinary person.
It has very easy to use design.
Draw, Edit, Collage all are very easy to be understood
It is very useful for people who use photoshop and graphic designers can also use it.
Its cons are:
Its resolution is limited to 2MP
Everything except this is excellent