Sketching in a sketchbook
markers
it seems these birds are called Cuban Todi ... sort of like that)
I painted with markers.
In general, markers have a tool for smearing transitions and a special marker like transparent.
there is a special transparent marker (blender) - though I don’t have it ... but you can mix it simply mechanically rubbing one into the other) True, it’s impossible to mix very strongly - but even so)