Halo with the Soft Fill buttons, plus every change from your notes: white avatar with a blue B, centred nav, a settings gear at the bottom, a cream tool bar matching the colour rail, a green Save circle with a download arrow, a bigger canvas, and remade tool icons.
The tile is white now, the B is blue.
B on top, home / draw / photos centred, a settings gear pinned to the foot.
Same plain pill as the colour rail. Home on top, tools centred, Save at the foot.
Back to a circle, with a download arrow instead of a star.
The drawing box now fills the space between the two bars.
Three pencil weights, a proper eraser, a classic paint bucket. Detail below.
The first three are the same pencil getting chunkier, so a kid picks a line weight, not a mystery tool. Then a real eraser and the classic paint bucket. The selected tool sits in a blue disc.
I made it a settings gear labelled "Grown-ups". That word is the warmest for a kids app, but "Parents" is the clearest and "Adults" is an option too. It still opens the maths gate, since purchases live behind it. Say the word and I lock it in.