Some serious stuff from me :

In krita you can manage references both as embedded to the canvas, and embedded to the monitor. If you pick Settings -> configure Krita-General -> Window -> Multiple document mode -> Subwindows You can open artwork and reference images as separate documents (ctrl+o), click window -> tile (ctrl+k) to have them on right and left half of canvas (if you want them to switch sides, click on the one you want to be on left, and click ctrl+k again). You can then adjust them if you want reference to take less screen than artwork.

Note that this way you can have a big, main reference that is separate from the artwork (you can scale, mirror, move it separately) and small “mood references” on your canvas using reference tool, just to look at from time to time.

Perspective assistant, with small impact on a canvas: create vanishing points (1, 2 or 3, as you need in the artwork) using painting assistant tool.

Then: View -> Show painting assistants -> Off (grids not visible)

And: View -> Show assistants previews -> On/Off (good to have it in a shortcut)

If you want to check if the perspective is correct you make ““show assistants previews - on”” and just see those lines. It’s easy to turn off when not needed.

You can still use snap to assistant in the brush tool options to get super precise construction.

My favourite one - picking the color without a docker. In keyboard shortcuts, in options you can change Show color selector from default shift+i to something closer to your non-dominant hand. Then you press it, and a big, full color selector shows off. You can customize its size in color selector options. The same goes with Show color history - you can also make those tiles way bigger. This way you don’t need to use the color docker. With presets and opacity on Right mouse button, ctrl+r to click-pick the new layer, layers management in keyboard shortcuts (duplicate, switch active layer, move active layer, grouping, change visibility and alpha block) you can stay in full screen and canvas only modes forever. Just you and your artwork.

Currently those pop ups appear, when you press a button, and disappear once you move your mouse away or press anything else (in color selector settings, in advanced color selector -> behaviour -> hide popup on click must be OFF - that’s super important). If someone with knowledge of krita documentation, could make it react to modifier slopes (you press ‘alt’ for instance, the popup shows up, and is active to the moment you release this ‘alt’ modifier), it would get insanely awesome. Now it’s only just awesome