I got it in nature .as mentioned above we cant just get this talent by consuming tablets drawing is really a valuable one it comes only by nature and interest in that art.as you have questioned whether we need to be talented in drawing for learning photo shop but its not so if you have basic knowledge of drawing it will be easier for you to learn.but photo shop is not that much concerned with drawing it mostly covers cutting,pasting,fixing,colouring and changing the patterns of the picture.