Pick a room, drop in your portraits, download the preview. No Photoshop.
Drop an image onto a frame or click it. Drag to reposition, scroll or use the slider to zoom. Landscape photo in an upright frame? Click Fit whole to sit it on a mat, and Mat to change the mount colour. Frame not lining up? Click Adjust frames, drag its corners to fit, then Export library to save.
Easiest: in your mockup, fill each photo opening with a solid magenta or lime-green block and upload that — the zones are detected automatically and the blocks are cleaned off. Or upload a clean room and click-drag on the image to draw each opening. Fine-tune any zone later with Adjust frames.
rooms.json manifest and an image folder (it auto-loads ./rooms.json if present). Build your collection here, then Export library to save it.