an anon asked me how i shade shiny spheres but i deleted the ask by accident (i’m so sorry sweet anon! ;v;) so this is just the picture!
i don’t actually have a set way to make things shiny to be honest! usually just combos of colours that have a high contrast (and my usual Vary the Spectrum spiel! highlights are yellower rather than whiter and shadows are tend towards deep blues or reds, depending on the base colour!), and they tend to look fine!
the last step for each is just brightness + contrast adjustments and the middle one looks better when it’s smaller, like for metal buttons on clothes and stuff! hope this helped somewhat! /)//v//(\