[Gallagher]

it's not that surprising, really. they're entirely different skill-sets that happen to have some similar foundations. that's like saying that you should be able to paint on canvas because you can draw fine on paper. yes, your existing skills will go a long way in getting you there, but there's still a lot of new things you need to learn. your tools, the techniques behind the medium, etc. it's a whole new experience.

that's the same reason why some people are better at traditional drawing and some at digital. yes, you can apply what you learn about anatomy and shapes and shading to any medium, but there's a lot more to it than that.