Loose concept art study of four scientists with sketchy lines

2x2 grid, do this for 4 famous scientists, 16:9 A = { primary gesture drawing of $ SUBJECT: full‑body or focal crop, with rough confident outlines } B = { secondary studies: expression close‑up, alternate pose fragment, detail crop (accessory/hair) } C = { sketchy shadow blocks: flat cel patches with soft edges, placed on the shadow side of forms } D = { construction lines: leftover guide strokes, perspective marks, circular joints, visible erasures }  SKETCH = (A ∩ centerpiece) ∪ (B ∩ scattered_crops) ∪ (C ∩ fill_layer) ∪ (D ∩ transparency) Where: - A is placed prominently, cropped dynamically, with line weight heavier on silhouette contours. - B elements are arranged around A on the white canvas, connected by faint gesture arrows. - C is a Boolean subtraction from the base colour (flat skin/fabric) on regions where light is occluded. - D is rendered as thin, low‑opacity strokes underneath the final ink. Palette: limited to {warm beige, cream, charcoal, cool grey, soft blue, muted skin}. Output: single loose concept art image, blank studio background.