I just realised... I don't know which way to sand some parts of the body!
In context of the pic below, I've been sanding the face parallel to the x direction, and also sanding the top and bottom in the x direction. What direction do I sand the inside of the cutouts though? And also the leftmost side of the body? z direction (out of the page)? I can't figure out what "in the direction of the grain" means for those two bits. Thanks!