Capture the terrifying presence of the medusa, a mythical bald female with obsidian snake clutter on her head and petrifying gaze. Emphasise the malicious nature of her abhorrent face with ironic grin and sharp predator teeth. Highlight her scaly snake body swirling around the obelisk. white marble green jade yellow basalt theme, use hdr and ray tracing to enhance visual impact and create an ultimate masterpiece