The eyes carry it
Beagle eyes are large, soft, deep-set brown — sometimes hazel — with an expression scent-hound breeders call 'pleading.' The portrait holds that register without exaggerating it. Watercolor handles the soft eye depth especially well. Meadow gives the eyes a natural outdoor light that suits the breed's working heritage. Snow lets the dark eyes anchor a cool pale palette as the centerpiece.
Tri-color or lemon
Classic tri-color Beagles wear a black saddle, tan flanks and face, white legs and chest with the iconic white tail tip (bred so handlers could spot the dog through tall grass). Lemon Beagles substitute a softer tan and cream pattern, often with paler markings. Both are rendered as your specific dog's pattern. The saddle shape varies between dogs and is preserved exactly.
Where the breed lands hardest
Watercolor, Meadow, Vineyard, and Snow are the natural fits — warm soft palettes that flatter the breed's friendly working register without formalizing it. The pack-hound history reads better in outdoor scenes than in interior court settings. Knight works for the more dignified Beagles. Pop Art can flatten the tri-color saddle into shapes; the breed loses some specificity.