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Create a YouTube video thumbnail sized 1280x720 pixels (16:9 ratio), with a final file size under 2MB, using the uploaded image of the female PK XD character as the main element, preserving her exact appearance, colors, and original proportions. Add the title "6th Anniversary of PK XD" in large, legible letters, using the same font and visual style as the official PK XD game logo (matching colors, shading, and outline), ensuring high fidelity. Use a vibrant, thematic background inspired by the PK XD universe, filled with many elements that convey fun and adventure. The result must have a professional, eye-catching look suitable for a children's audience, maintaining high quality within the specified file size limit.