Should the Gaṇeśa idol’s trunk turn left or right?
a left-turning trunk is the usual choice for homes; a right-turning (dakṣiṇāmukhī) form is traditionally linked with stricter worship, but neither is unlucky.
Most Gaṇeśa idols in homes have the trunk curving to his left (our right as we face him). This form, sometimes called vāmamukhī, is associated with calm, gentle and household blessings, and is easy to worship daily.
A trunk curving to his right (dakṣiṇāmukhī), as in the famous Siddhivināyaka of Mumbai, is believed to be more powerful and to call for regular, careful worship — which is why such forms are more common in temples. A straight trunk is rare and considered especially auspicious.
This is a belief about suitability, not a rule of fear. If you already have a right-trunk idol at home and worship it with love, there is no reason to remove it. When buying new, choosing a left-trunk sitting idol is the simplest guidance.
Left trunk: common for homes · Source: popular belief and temple tradition
Dharma Q&A — worship at home · Ask a Jyotishi your own question