I think being able to draw, paint, sculpt, or do photography is an advantage in making 3D art. Knowledge of color theory, composition, and such are a big help. But, it is imagination and creativity that count most. Gain skill in a medium like TS/3D and general knowledge (composition, color), apply creativity and imagination and you'll make great images. Many fine 3D artists can't create art any other way!
People like Steinie, Prodigy, W!zard, and Marcel (and many others here, can't list everyone) have much knowledge, experience, and talent and they bring all of that to 3D.
You will be able to make characters. Beginning with no 3D knowledge I learned TS abd studied info. on the web and in the forums. I made a character. Not near Steinie's level but good enough. Here he is
http://www.finis.phosphorgallery.com/Pa ... s2007.html"
3D'ers technical skills make some of the images here great. 3D'ers artistic talent makes some great. The best have both. Use your knowledge of drawing but build skill in the medium of 3D/TS to create images. The tech skills will come with study, practice, and experience. The concepts from that technical skill often transfer to other programs too!
I prefer dangerous freedom over peaceful servitude. -- Thomas Jefferson/Jean Jacques Rousseau