Hi there 
I see you are new to the forum, so I have to ask that you please follow this link and compete an introduction for us, so that all the technicalities and rules are in place 
How you see Luna varies from practitioner to practitioner and depends to a great extent, on which- if any of your claire and astral senses are developed. Some people see spirits in their mind like vivid imaginations, some see them right out there in front of you, like you might imagine seeing a ghost, and many do not see a damned thing.
I personally get what I call impressions, it’s a very distant feeling, outline with some details that are not very clear, and if I could make pictures with my mind, I would think they were imaginations. Thankfully I can not, so when I see anything I know I saw it, but most of us don’t start out just seeing.
It takes some time and practice to be able to see most sorts of spirits, but not always. I personally see spirits of the dead and shadow creatures/people, the most vividly and have since I was a child. That made seeing some sorts of spirits, like the Loa, rather easier, but demons and angels, gods and servitors I still to this day do not see nearly as well as those, I just get those impressions.
If you have no open senses and you experienced nothing, that is rather normal. Luna can still hear you, even if you cannot sense her. If you noticed the room temperature change, felt like someone else entered the room, like you were being watched, got goosebumps, had an ear ring, or I’m sure there’s a few I am forgetting, those would be more normal indications that Luna heard you, than seeing her- if you do not have open senses. Even changes in emotions, or feeling more lighthearted, less sad, less upset, more like you have clean air around you- would be somewhat normal with Luna.