Sequential Portrait Pencil Sketches

I need four high-resolution, pencil-sketch illustrations for a folded C6 brochure. All four must keep a realistic look and capture subtle facial expressions. The sequence is important: 1. Illustration 1 mirrors the “top” reference photo exactly. 2. Illustration 2 still reads as the top photo, yet begins to hint at features from the “bottom” person. 3. Illustration 3 feels mostly like the bottom photo but retains a touch of the first face. 4. Illustration 4 is a faithful rendering of the bottom reference photo. Please work digitally in a pencil-sketch style so I can receive clean, print-ready files (minimum 300 dpi, CMYK, suitable for a four-page C6 layout). Final delivery: layered PSD or TIFF plus flattened PDF of each illustration. Accuracy in likeness and expression will be the key acceptance criterion. Let me know your timeframe and any reference dimensions you require so I can supply the photos right away.