St Peter's Basilica, Renaissance architecture, grandeur, ornate details, large dome, intricate stone carvings, statues of saints, imposing columns, marble floors, gilded ceilings, stained glass windows, majestic arches, vibrant frescoes, intricate mosaics, Baroque influence, Bernini's Baldacchino, sculpted altarpieces, grand high altar, apse, nave, ornate chapels, soft natural light, dramatic shadows, symmetrical composition, 3/4 view, warm ambient lighting.