Common mistakes include overcomplicating cladding by using too many siding materials or colors, which causes visual clutter. Oversized porches that block daylight reduce interior natural light and disrupt proportion. Ignoring consistent window and door head heights creates a chaotic feel. Avoid forcing symmetry, which conflicts with the home's quirky footprint. Failing to coordinate trim and roofing colors impairs cohesion. Instead, celebrate irregular shapes by simplifying palettes and maintaining balanced proportions.