DC shunt motor losses
If you increase the load to a series motor at constant input voltage (an assumption about supply voltage was not stated in your question, the answers will be different if we make a different assumption, like voltage is increased to keep the speed constant), then the current goes up, and along with it the magnetic field swing occuring in both the stator iron and the armature iron, and the speed goes down.

Therefore the losses that rise are those proportional to current, and to magnetic field.

The losses that drop are those proportional to speed.

Have another look at your list of losses, some of them are correct.