Just PS sketches.
For presentations, I often just do frontview/sideview/topview elevations in Photoshop to explore different directions.
They are very quick to pump out and its easy for me to get into a rythm. For this project I did about 30.
For me CAD is just to elaborate and slow at an early stage and handsketches often don’t give me the right amount of dimensional guidance to consider the internal structure for a good idea about proportions. I always draw the PS concepts at 1:1 scale and use these renders for modelmaking as well.
The hand sketches in this image were actually done after PS rounds and before CAD.