Please accept my blessings. I beg to acknowledge receipt of your letter undated, but I know this letter was received a few days ago, and I could not reply earlier on account of heavy pressure of so many letters. Anyway I may inform you it does not matter that you cannot paint one picture daily, but you go on doing it as many pictures as you can finish in a month or in a week. Do it nicely and I don't press upon you. But the idea is that I wanted so many pictures from Srimad Bhagavatam but I wish that some of my disciples, either individually or collectively may produce at least half a dozen pictures daily. Anyway I think Krishna will give you strength more and more. Do not stop your work, go on painting as far as possible.
Regarding your question, what color is the ocean of milk, it is white. You can make it bluish shade in order to distinguish that it is water. Vishnu's color is sky blue, and Lakshmi's color is just like gold, molten gold. Laksmi is not always with Visnu, there are many Visnu forms Who is alone. That form is called Vasudev Vishnu. No demigod remains with Vishnu.