autumn river: large oil painting in speedpainting style

large oil painting river autumn speedpainting style orange cyan brent heighton digital uhd yanjun cheng light magenta blue landscape scenery colorful artwork nature fall season vibrant colors artistic representation scenic beauty expressive brushstrokes impressionistic art home decor contemporary modern inspiration visual appeal collectors enthusiasts gallery exhibition techniques highquality expression river: dynamic showcasing fusion zoological elements expression intricate details bold palette knife strokes bring life complexity subject harmonious blend metallic earthy sky tones adds depth movement artwork