You picked Halo. So here are three ways to draw the round nav buttons, then the drawing screen rebuilt the way you asked: home at the top of the bar, the page name centred, and Save fused to the bottom of the bar in green.
Shown in Bobby's blue. iPhone gets the same treatment next round.
Pick a button style
Three ways to draw the circle
Same rail, same soft-blue tint, same three icons. Only the button treatment changes. Each shows Home active with Draw and Photos resting, so you can see both states.
1 ยท Soft Fill
Active fills solid blue with a soft glow. Resting buttons are a pale blue disc. Calm and modern.
my pick
2 ยท Halo Ring
Active is a white disc wrapped in a blue ring and glow, like a target. Resting buttons are a faint outline.
3 ยท Lifted Pillow
Active pops off the rail as a chunky 3D pillow. The most tactile, matches our pillow buttons elsewhere.
In context
Home with Soft Fill
The full Halo home with option 1's buttons, so you can see the rail against the real content. It re-skins instantly to whichever style you choose.
Home
Drawing screen ยท reworked
What changed on the drawing screen
Home moved to the top of the drawing bar, as the first button.
The page name ("T-Rex") is centred up top, on its own.
Save is fused to the bottom of the bar, still green, so tools and the save-your-work button live in one connected column your thumb never leaves.
Colour rail stays on the right. The smiley is still gone.
Next round: once you pick a button style, I apply this exact Halo system (rail, buttons, reworked drawing bar) to the iPhone layout too.