I think you should either upload the concept instead of waist up, or upload them together. Like you could do the waist up shot with just the plain front view concept sketch included (doesn't even need to be coloured). And then people can request the full concept also if they want it.
I chose "yes" because I think it's REALLY hard to draw foot, especially if I don't know how the shoes looks like. I like your waist up but I think people who adopt your characters may want to see the entire body.