Need Some Advice On My Evocations - Mepsitahl, mepsitahl Options

well Ive done another evocation tonight of Mepsitahl. and I did the full LBRP and hexegram and I used the goetia evocation. the full lot. and the most I get is a brief flash of her from a recollection I had of another time I did it and was messing around and got full view of her., beyond the mirror just after the evocation when the energy is strong after that i see no sign of her. and then I hear laughing? what gives ? ( and this happens everytime I do an evocation regardless of spirit) and then I hear like voices like someone having a conversation in the background but I cant make any sense of it. (I could be trying to hard to hear something and I do that to help manifest a voice. and then just random stuff happens in my mirror like normal scrying and there is no communication. I dont know if that is anough to say the welcome and I cant even check the identity. Is it because she is a fictional spirit? Im pretty new. only a couple years so does anyone have any advice I can try for next time? any help would be much apprecated. thank you

about no manifestation:

You're right, there's no reason to have a visible appearance if you get what you want. Some spirits though, like goetics, tend to be very unstable if you can't see them. They get frustrated, IMO, if you can't see or hear them and they start to really mess with you. I tend to try to put myself into a very positive state of mind, because chances are, I won't see or hear a spirit, but I still know that they are listening and that I can be their worst enemy if they don't do what I ask. That's with demons, anyway. So be confident about the whole thing, and don't leave your circle without banishing first if you are working with a demon!