I began painting portraits of the Gods by painting one of my GD for myself. He suggested I should paint all the Gods. I said yes I will. Satan communicated to me through a dream (I'd been working on two preliminary sketches of two other Gods) put those aside, you're painting ME next. HPS Maxine has said when approaching a God you haven't before, to go through Satan. Well, I'd forgotten that, so Satan made sure I did so by stepping in and telling me to paint HIM, vetting me out Himself first. After which He gave me His go ahead to approach any of the other Gods.
When I begin a new portrait I still address them and say this is my intention, ask the God in question if they are ok with this and for their imput. I ask if they would please let me know if there is anything I put into your portrait you want me to correct, let me know what you would like and I'll do my best to give it to you. I know when they are helping me because when it happens there is no time spent debating and wondering what to do next. The information is just there; I get pictures in my minds eye, often I have to work fast to keep up with what I'm being given. Hours pass like minutes. And what happens (for me anyways) is that there comes a point in the work where the portrait 'animates' in my third eye and I 'see' the God/Goddess looking back out at me.
What I'm saying is that it is best to ask permission of the God in question first, going through Satan. Its a matter of respect and being polite, and that way when they have said sure, go ahead they'll help guide your vision so you get an accurate representation. Thats been my experience, anyways.
I don't fast and burn incense though.