Very trivial tidbits
Coloring my designs.
For example, this

He is white-themed in appearance, but have shade difference of tint of the "off-white" colours of his.
His hair is supposed to be orange tinted, his skin is pinkish, and his eye is greyish purple. Meanwhile, the outfits are "pure" white but is of different levels of darkness.
And the image further proof that in some methods rendition, it won't even show.
He also supposed to wear glasses, but I forgot to put it there.
Talking about color, I am pretty specific in my characters' hair, they may not be diverse but specific.

I really like those hair color chart that dye products provide. That's probably the root of my weird fascination.
Last but not least, world and lore related clothes and accessories and makeup

If not why I dedicate a colored sketch with lengthy explanation to draw more headdress and the same character with face done differently.