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Adding different art style tags also can get some nice result, (picture is sketch style), you guys can try it:
sketch
{{lineart}}
{{watercolor pencil}}
{{faux traditional media}}
{{{monochrome}}}, {{{gray scale}}}, {{{pencil sketch lines}}}
{{{retro artstyle}}}
monochrome, lineart
official art
{{{posing sketch}}}, {{monochrome}}
three views from front, back and side, costume setup materials
pastel color, sketch
{photorealistic}, {painting}, {oil painting}, {realistic}, {sketch}
multiple views
{{{alphonse mucha}}}
magazine cover, official art
persona 5, partly colored, official art, red background