When I try to smooth out Melvin, it just doesn't work at all. I have all the same settings as you, the scale 1:1:1, and Dyntopo on. But when I try to do it, it sorta smooths it, but doesn't add nearly as much geometry as what yours.
If you have the exact same settings ("relative detail" for example) you have to keep your camera at the exact same distance to your model as Kent does in the video.
You can only smooth existing geometry. Try setting your brush-strenght to 0 and click on an area without smoothing to create new geometry without deforming the mesh. Then smooth on that area.
I find this easier with "constant detail", "collapse edges" and a value around 5%.
I hope I understood the problem and could help ;-)
Kent Trammell
replied
Lucas is right. The Smooth brush doesn't create any geometry. It only smooths out what's already there.
