Remove the shadows in Keyshot, or Right click the model, and "Move to floor/ground". But part of the model is already touching the floor, so I guess you need to adjust it. Keep going man.
Hey man! Looks really good! Be careful, the keyshot render looks like it is flying, sorry if it is like that, but I personally find it weird. Everything else looks great, I can´t wait to see the textured low poly.