By the time I’m done sketching, I generally have a solid vision of what I want to model in 3D. There is certainly widespread debate in design circles around the value of showing loose sketches or polished models to the client. I almost always tend toward more polished models, operating under the assumption that most clients can’t visualize what a final form will look like when reviewing a sketchy pen drawing. I’ve also become much more versed in 3D modeling than any other medium, and it really doesn’t take long to generate schematic level models.