Curate, connect, and discover
This is Sans’s design, explained as well as it can be, since I can’t really draw him.
Pre-Castle fight he looks exactly the same as in the game.
After he fuses his soul with the PATIENCE and JUSTICE souls, he wears the cowboy hat that the ribbon is attached to the brim. On the right hip is the knife and on the left hip is the gun. His right eye is teal and his left eye is yellow.
Post-Castle fight has his health permanently at .5 and he has no sleeves on his coat anymore. He has Papyrus’s scarf covering his left tibia and fibula, as there is a gap in the tibia that is constantly bleeding. He has a crack on right eye due to a spear from Undyne. He lost one of his slippers, your choice on which one.