A little tip that I have picked up from studying the work of Neville Goddard in more detail:
Using the sense of Sound and Smell while visualising.
So you have imagining seeing the person in your visualisation sessions, but what if you add that extra special smell he has? Maybe you remember how he smells, maybe its a smell you associate with him. For example, I can recall his scent and the cologne he usually wears ... and I can also smell his apartment. That sounds weird, but practice "smelling" a lemon without there actually being a lemon in the room.
Secondly, I imagine distinctive sounds during my visualisations. I remember the sound of the air conditioning in his place where we spent a lot of time together, I remember the sound of his dog's chain when he moves around. I remember the sound of his voice of course ...
these extra things can really amp up and speed up your manifesting!