Regarding your question why does the moon appear in pictures of Krsna yet the abode of Krsna is described as having no need of sunlight or moonlight, the answer is that these pictures show Krsna as He appeared in Vrndavana 5,000 years ago. It may be understood therefore that it is the moon of this world which is seen along with Krsna in these pictures.
Letter to my dear daughter Indrani, 26 July, 1970