Is it possible to lower the front/inner part of the eyebrow?

A short scar temple lift (lateral brow lift) can be done with incisions hidden behind the hairline in most. It will give the illusion that the inner (medial) brow is lowered in relationship to the  lateral brow which is elevated. If you still want the inner brow a bit lower you can use Botox selectively.

You describe the ideal brow shape, which has the outer part (tail) higher than the inner part, with the peak of the arch more lateral. Most of the time when the tail of the brow is raised and the peak of the arch set at the right level, it is not necessary to actually lower the inner part. This can be done with a temporal brow lift. It is easy to lower the central brow by Botoxing the central forehead, which relaxes the muscles that elevate the brow.

Actually, Botox or an equivalent product, properly done, can be very effective at both lowering the medial brow and raising the lateral brow----sometimes too much giving a "wicked" look!