Turn a rough sketch into a finished concept render

I'm attaching a rough sketch: {{describe what it shows and how finished it is}}. Render it as a finished concept image while keeping my composition.

Keep exactly: the silhouette, the placement of every element, the camera angle, and the proportions between objects. Do not add or remove parts I drew.

Add: {{material and finish, e.g. brushed aluminium and matte grey plastic}}, believable lighting from {{direction}}, contact shadows where objects meet a surface, and a plain {{colour}} backdrop with a soft falloff.

Style: {{industrial product render / painted concept art / architectural visualisation}}. Neutral colour grade, no lens flares, no text, no watermark.

Give me two versions: one tight to the sketch, one where you fix only the proportions that look structurally wrong — and tell me in one line what you changed in the second.