The detail that got me was the small light-colored dog sitting at the lower window pane right beside the lit tree, watching the whole scene from inside. A display this tidy already looks great from the street, but that little touch of life in the window is what makes it feel lived in rather than staged.
The layout itself is well thought out. Warm white string lights run along the roof eaves, and icicle lights hang there too, which the maker confirms putting up. Below, the porch pillars and the front doorway are wrapped in garland strung with white lights, and each of those wraps is finished with a large red bow. A glowing Santa decoration hangs under the central gable above the entrance, and an illuminated tree glows from the window near the front door. On a single-story house, that stacking of light at the eaves, the porch level, and the glass reads as one clean, layered composition.
What really sells it is the setting. Snow blankets the ground, the roof, and the shrubs and trees around the house, and the whole thing was captured at dusk or nighttime right after a fresh fall. The maker calls the result pretty cozy, and I agree with that description. The warm white palette against fresh snow is a classic pairing for a reason.
One open question: nothing is said about how the lights and garland were actually attached, and on icicle strands that is no small matter. The maker has said those strands are a pain to hang but kept them anyway because they look cute, which strikes me as the right call for this kind of look.