I’ve been facing this issue recently, and I’ve tried looking at a photo beforehoof to no avail. Seems that I’m better with an image I saw a while ago, glanced at, thought yeah whatever than one I drooled and ogled over. But I just love drooling and ogling over the beloved and I get a fairly feint visualisation.
What I do get, are sensations. What I take to be his smell, aftershave as opposed to feet, farts and burps, occasional stroking, heat in certain areas, an urgent pressing and pushing into me - use your imagination for this. His voice, which oddly is lower in visualisation than in reality, but it’s him.
Occasionally I get a déjà vu or premonition type thing.
I’m probably doing it all wrong, but I’m ok with it. I wish I could get the full technicolour 3 d holographic special some purport to have, but I guess horses aren’t made that way.