Perhaps wartime is not a good time to walk around photographing ships. It would be interesting to see how many photos are taken in peacetime compared to wartime.
Cameras were banned aboard ships in early WW1, there was instructions that they had to be placed in the care of the captain.
As time went on, the restriction was relaxed and it became the habit of officers to have a draw-sting bag to take to their action station with them. It was filled with little comforts and neccessities containing things like an apple & drink, a towel, jumper, scarve, pillow, pad & pencil, etc. They could be there a long time and along with items they needed, the contents aided comfort.
A camera was often in his bag and indeed, these are the photographs of battles of Heligoland Bight, Dogger Bank and especially Jutland, along with all the rest of the photographs of WW1 ships out at sea. IIRC, it was only after Jutland that anything like an official photographer was consented to.
My take on the watercolour: if one Monmouth class was painted disruptively, then Kent was probably likewise.