Why scale is the portrait
Great Danes are tallest among dogs and the height is breed-defining. Formats that can hold scale — Knight, Emperor, Mountaintop, Library with vertical proportion — read correctly. We preserve the long limbs and deep chest without compressing them to fit a frame. Your Dane occupies the composition at the proportions of the dog you actually have, not a stunted version.
Six coats, six portraits
Fawn (tan with a black mask) reads cleanest in Library and Knight. Brindle (tiger-striped fawn) catches Library with added depth. Blue (steel-grey) sits cleanly in Watercolor and Mountaintop. Black becomes pure silhouette against pale palettes. Harlequin (white with torn black patches) reads as graphic geometry — Pop Art works here. Mantle (black with white blaze and paws) suits Knight.
Where the elegance lands
Emperor was practically written for the long-headed, deep-chested noble subject. Knight reads as natural for the tallest breed in armor. Mountaintop gives the dog the landscape scale the body deserves. Library lets the senior Dane sit with full quiet weight. The breed's elegance is built in — the portrait just lets it occupy the frame correctly.