So youre still fairly young with light colouring. In that case, brow enhancement can be tricky as they easily take over your face if youre not careful.
A make up artist i used once recommended powder for blondes as it looks more natural. Anastasia Beverly Hills does a powder duo compact in ‘Taupe.’. I think the lighter colour would work on your inner brow and the darker colour would define the tail nicely without looking heavy. Use the ABHills brow brush to apply and the spooly on the other end to brush through. That gives the most natural result.
Have you ever been to a salon to get HD brows (wax, shape, tint, fill etc.) They’d advise you. Ask for an ash blonde tint.