Refine Vintage Poster Faces

I have rebuilt a classic Star Wars–style one-sheet in Adobe Photoshop and pushed it about 90 % of the way. The layout is locked, the text is set, but three face areas still betray my amateur touch—especially Chewbacca and C-3PO, whose current swaps look copy-and-pasted rather than painted in.

I need an experienced Photoshop artist to:
• Redo those three face swaps so they sit seamlessly in the scene—highly realistic, no visible cut lines or mismatched lighting.
• Rework shading, tones, and subtle paper-grain texture so the entire poster reads as one cohesive vintage print, not a collage of parts.

The final piece should preserve the authentic “Vintage look” I’m after while standing up to close inspection and large-format printing. Please keep everything layered and non-destructive so I can tweak text later if needed. A print-ready CMYK TIFF/PSD at the current resolution (600 dpi, 27" × 40") will be the hand-off.

If you live and breathe Photoshop blend modes, dodge & burn, and texture overlays—and you can make a Wookiee look like he was always painted there—I’d love to see a quick portfolio sample of similar restoration or poster work before we start.