Cette toile a déjà pris de la valeur
How about "This painting has already increased in value."
Probably that, with the 'increase' and 'value'. It makes the most sense.
Or maybe "This painting's value has appreciated."
This canvas (or painting, though toile is canvas) has already taken (or gained, I think that is more grammatically correct) value.
Or, "this canvas has already gained value"; that is the closest I can get.
This canvas [painting] has already gained in value.
This canvas has already taken on value.