I Tried out these apps:
1: Paint pad
2: Mobile paint
3: Lapix
4: Xpress sketch
Xpress sketch is the winner!
here are some of the tests...
Macho man:
Done with Mobile paint... Very primitive sketch app...not impressed at all!
Cloud maker:
Done with Paintpad
The theme was that the little girl is painting the clouds.
This one is Done with Lapix...
Lapix has nice soft brushes with opacity control. still, Xpress sketch is better
btw, this is not India gate...its just a random form...
Sunset: done with Lapix
Landscape: Done with Xpress sketch