First dedicate your soul to Satan (if you didnt) .
Second Father will appear to you if He will choose to do this. Summonig Him would be highly disrespectfull
Also you need to open your 3 eye to see Demons or anything in astral dimension .
Hmm about the images try to make them harder to visualize you know like the first is easy second harder third more harder etc. Bro of course do not stop doing yoga protection meditations and cleanig your aura coz there are the basics medditations and also void of course .