David playing the harp

David playing the harp, painted in 1625 and currently without a documented institutional collection in available records, belongs to the tradition of Old Testament narrative and devotional figure painting that complemented de Vos's portraiture practice. David as harper was one of the most popular subjects for this devotional type: the psalmist king could be depicted as an idealized young man in ecstatic musical communion with God, combining royal dignity, youthful beauty, and spiritual intensity. In Flemish Baroque culture, images of the young David often carried a semi-portrait quality, as painters used specific models while painting nominally scriptural subjects. The 1625 date places this among de Vos's mature works. The companion painting King David presenting the sceptre to Solomon (also 1625, also without a documented collection) suggests these works may have been conceived as a pair exploring the transition from David's personal piety to his political legacy.

The single figure composition allows de Vos to concentrate technical attention on the face and hands — the key expressive elements in a musical devotional image. The harp itself requires careful still-life rendering of its wood, strings, and gold fittings. The palette likely employs warm golds and ambers appropriate to the regal but intensely personal devotional moment.