Question: Do we need to 开光 (consecrate) Buddha/Bodhisattva images for veneration on a shrine?
Answer: I recommend you to consecrate it every day with your Dharma practices like chanting, meditating, offering, circumambulation, sharing of merits…
Question: Yes I will do that. But is a formal consecration necessary?
Answer: Not for some, yes for the insecure. There’s no way to know for sure another consecrator is as virtuous and sincere, connected to the Buddha as yourself actually.
The formal consecration, if chosen, is like the first spiritual ‘charging’ session… But what more important is regular and personal ‘(re-)charging’.