A sleek, black and gold mecha arm with advanced materials and futuristic design elements. The prominent shoulder pad is on the left side of its upper body, while it holds out an open palm for dynamic action poses. It features multiple visible mechanical parts beneath skin, adding to its high-tech appearance. This detailed concept art captures every detail in an ultra-realistic digital rendering style in the style of digital rendering. White background. --ar 3:4 --style raw --stylize 1000 --v 6.1
