Create a professional, highly detailed vector art illustration of Tower Bridge, blending pencil sketch textures with 3D rendering aesthetics. The bridge should be depicted in a dramatic perspective, showcasing its gothic towers and suspension chains with intricate linework. Strong outlines will emphasize the structure's architectural beauty, while subtle pencil-style shading adds depth and texture. The composition should include dynamic accents like swirling clouds in the sky and faint ripples in the Thames, both rendered in fine detail to complement the main subject. The background must be completely transparent, ensuring it integrates seamlessly onto any T-shirt fabric. The design should be monochromatic with gradient grays and whites, creating a timeless and professional look ideal for a sophisticated yet creative London-themed T-shirt.