Given Curaçao's recent history I would have thought to find Dutch —or at least inspired by the Netherlands— design, similar to what we have found in Sint Eustatius.

The sign at hand, however, is clearly inspired by the Mediterranean group of signs (see an overview of the type in Malta).

They run light without any bookbag (†) and therefore come closest to a Portuguese variant of the design.
Notice also that the girl kept her hair; not so in Portugal.

† Perhaps homework is not known in either country?