Hare Krishna, actually the process of deity worship is start with mood and worship of Lakshmi Narayana. Which means that we dress and worship them with great reverence like serving a king. When a devotion become more mature then our relationship can be more informal.

Srila Prabhupada writes Madhusudana in January 24th 1969 Los Angeles

Regarding your question about why we dress the Deities in very opulent fashion and not as simple cowherds boy and girl, this is an intelligent question and the answer is that according to the regulative principles we cannot worship Radha-Krishna now. Radha-Krishna worship is meant for persons who have already developed spontaneous love of God. In the training period we are only worshiping Laksmi-Narayana. We worship Radha-Krishna because Laksmi-Narayana is there also, but actually we do not worship Radha-Krishna with our present Deity ceremonies; we are worshiping Laksmi-Narayana. Narayana is there when Krishna is there, but actually we do not worship Radha-Krishna in Their Original Form. This is why we should worship Radha-Krishna in Their Laksmi-Narayana feature with all respect and reverence. If we deviate from this standard then we shall be prakrta sahajiya, or a person who takes things very cheap. We worship Laksmi-Narayana, and because Radha-Krishna includes Laksmi-Narayana, there is no necessity of installing a Laksmi-Narayana Deity. It is just like a king who is engaged in administering justice. Actually that business belongs to the justice department. But what is that justice department? It is all part of the kings energy, and the king also has the power to execute this function.