Wow Avi K I’m surprised your comment went through. I don’t even get close to that and my comments get deleted lol.
Besides yitzyk brings up a good point regarding if it keeps you from sinning. When Yosef hatzaddik was in the midst of a great nisayon, it says he saw an image of his father which stopped him from proceeding. So obviously these things have an affect on us. The only thing is by Yosef it was an image that he saw probably ruach hakodesh or even if it is an image in the mind which is more likely for regular people. But again how can והיו עיניך only apply suddenly to a generation that has pictures, how would it apply to the past thousands of generations that didn’t? Maybe עיניך isn’t literal and can mean the image in your mind? I mean if it’s a Rabbi that you never seen and there are no pictures of them, you would have to imagine how he looked like anyway right? Rashi, Moshe Rabbeinu etc. Maybe it doesn’t even mean how they physically looked but of their essence?
Also when it comes to pictures it’s one thing to have a picture on the wall to remind you but to start carrying around and take it out every time you are in a situation that you need to daven for, it can become a little tricky.