Add Realistic Signatures to Photo

I have a high-resolution photograph that needs a subtle but convincing upgrade: 3–5 completely new signatures must appear on it as if they were always there. No existing scans or samples are available, so each autograph has to be created from scratch, styled to look natural and written with believable variation in pressure, stroke width, and ink flow.

Once the individual signatures are designed, place them on the image so lighting, grain, and perspective match the original scene. The goal is a seamless composite—no tell-tale digital edges, no mismatched shadows, and certainly no repeated brush patterns. A trained eye should not be able to spot the edit.

Deliverables:
• 3–5 custom-drawn signatures (each on its own transparent layer)
• The final photograph with signatures perfectly blended, supplied as a high-quality JPEG/PNG
• The layered PSD so I can tweak placement or opacity later if needed

Please keep all work in Adobe Photoshop (or an equivalent app that retains full layer fidelity).