You need a brush to draw soft shadow “hah”
There’s so many options but you can use airbrush to soften it
Also you can use “basic 4 flow opacity” it’s so soft in shading
Or… You can use “basic 3 flow”
Try all of this three options and If my recommendations not your liking tell me.
Oh You can download this brushes! It’s so good for illustrations and concept art
