A short puff beside an open shoulder concentrates visible fullness at the upper arm. This closer pale front has large short sleeve curves with a sheer-looking surface. The upper edge sits below the shoulder tops at the sides. Curling floral motifs and vertical lines organise the bodice, above the beginning of a wider quieter skirt. Unlike the longer loose references, this sleeve form does not continue towards the wrist. The larger exposed arm section is a clearly visible part of its contour.
Choose that short boundary first. Do you want fullness in precisely this area, or mainly the lowered upper edge? Compare those properties separately. You can ask for another neckline alongside a related short sleeve form, but need to see an actual model connecting them rather than assuming the combination is available.
Assess the candidate from the front with arms relaxed, then with hands brought forwards. Add the intended bouquet and look at the side outline. The photograph confirms neither a fibre nor interchangeable sleeves. Short length, principal side fullness and preferred upper edge provide enough concrete information to describe the shape you want at a fitting.