A close up of a clown with red hair and a clown mask

Craft a digital painting that emphasizes the eerie charm of Pennywise the Clown from Stephen King's "IT." Focus on capturing his iconic, malevolent grin, which conceals the darkness lurking beneath. Use a sinister color palette and shadowy lighting to create a sense of foreboding and unease. Let the unsettling details of his costume and the haunting allure of his expression take center stage in this portrayal.