Realistic Landscape Illustration Needed

I’m after a single, high-resolution illustration of a landscape rendered in a realistic style. Please handle everything from the initial rough concept to the final polished artwork, keeping accurate textures, natural lighting, and true-to-life color palettes in mind.

I’ll need the finished piece delivered both as a flattened PNG/JPG for quick viewing and as the layered source file (PSD or equivalent) so I can make minor adjustments later if necessary. Let me know your expected turnaround time, any questions about scene specifics, and a quick look at similar work you’ve done so I can be sure we’re on the same page before we get started.