You would think that the artist was using the original toy as a reference, given the presence of the metal connector pins on the smaller Spike Headmaster's hips and knees and the presence of the screws on Cerebros's arms and waist, but... there are actually an additional pair of screw holes omitted from the middle of the arms near where the elbows would be (although I'm going to chalk that up to artistic necessity to let Cerebros have actual elbows at all compared to what the original figure had)