Pair of costume design illustrations bearing signatures

The provided image displays two individual rectangular illustrations on what appears to be heavy white paper or cardstock. Each illustration depicts a stylized female figure in a floor-length gown, seemingly inspired by classical mythology. The top illustration shows a figure in an orange and red flame-motif dress, annotated at the top right as 'JUNO' and 'FIRE'. The bottom illustration shows a figure in a green gown with foliage patterns, annotated as 'CERES' and 'EARTH'. Each piece includes textile swatches attached to the lower right corner, consistent with professional costume renderings. Both pieces bear what appears to be an identical signature in the lower left corner, which reads as 'Sally Kathryn Vestal'. The condition appears good with minor edge wear; however, the items appear as unmounted loose sheets. These works are stylistically consistent with theatrical or operatic costume design sketches from the mid-to-late 20th century. While the names suggest specific characters and the signatures suggest a specific artist, these attributions are hypotheses subject to in-person verification by a specialist to confirm the medium and the legitimacy of the hand-written markings.

Based on my examination of the image provided, I am viewing a pair of costume design illustrations on paper, depicting figures annotated as 'Juno' and 'Ceres.' The works bear signatures consistent with the name 'Sally Kathryn Vestal.' From these photographs, I can observe the presence of attached textile swatches and handwritten annotations, which are characteristic of professional theatrical renderings from the mid-to-late 20th century. However, I cannot verify the specific medium, the age of the paper, or whether the signatures and notations are by the hand of the artist without a physical inspection. The current estimate is based on the hypothesis that these are hand-rendered works by the named artist. The market for mid-century theatrical illustrations is driven by the reputation of the designer and the aesthetic appeal of the character designs. Comparable costume sketches associated with documented regional theater or operatic productions often occupy this mid-range price point. Should these be determined to be later reproductions, digital prints, or works 'in the style of' rather than hand-painted by the artist, the value would likely decrease significantly to a decorative range of $50–$100. To reach a more stable valuation, an in-person examination is necessary to confirm the legitimacy of the signatures and to ensure the textile swatches are integral to the period of creation. Provenance documentation or production history would also be required to substantiate the attribution. Condition appears good from what I can see, though the unmounted nature of the sheets necessitates professional handling to prevent further edge wear.