Answer:
My second is performed by my first, and it is thought a thief by the marks of my whole might be caught.
What occurs once in a minute, twice in a moment and never in one thousand years?
I have eightyยญ-eight keys but cannot open a single door? What am I?
An artยญ-form and its colour-ful result.
A canvas full of stars.
Though not a plant, has leaves. Though not a beast, has spine. Though many wouldn't need this thing, It's more valuable than wine.