Eyebrows for an oval face
An oval face does not need a brow to correct anything, so the natural shape is usually the best starting point. A soft angle and natural fullness keep the balance.
The two changes worth making are a slightly defined peak, which gives the eye a line, and a tapered tail, which stops the brow ending bluntly.
With nothing to correct, the brow should look like a tidier version of itself. A soft angle and a tapered tail add definition without changing the proportions of the face.
Soft angled arch
Follow the natural brow line and add a gentle angle above the outer third of the eye. The shape should look like the brow you already have, tidied.
Natural fullness
Keep the brow as full as it grows. An oval face carries a full brow well, and over-plucking changes the balance for no benefit.
Gentle taper
Narrow the tail gradually towards the temple. A blunt end looks heavy on an oval face.
Skip: over-thin brows
Thin brows make the face look longer and the eyes smaller. Natural fullness is more flattering here.
Skip: a very high arch
It adds height and can make an oval face read as oblong. Keep the peak moderate.