Nice stuff Chesso, all I can say is graphics truly are a royal pain... But to be honest, I have found mine improving greatly lately due to software changes and input methods changing (yay)... I really suck like hell with a mouse and photoshop. But give me a touch screen and InkScape or Alchemy and life is soo easy. Don't know about the iPad though since I doubt it runs inkscape or krita (two of my favorite after PDN).

About porting, I would port to android first since it is linux and thus you don't need a mac or many changes (depending on how OS dependant code is) then once that works towards iOS last. Just some food for thought.