Ono's sketchaday April

I managed another skecth today. Car and astronaut (I am easily distracted).
I would like to get used to skecth in bigger size, all the previous sketches are thumbnail size, this one is A4 and I can get more detail although it’s more difficult to get going.
Also I’d like to be better at defining surface details in sketches, I always end up heading for the 3d model quickly and I loose out on the potential of the exploratory sketchy phase.