Stuck

I've never done this before; actually talked about something that troubles me, in here. But I still feel like this is the way to get answers and maybe some help better than by writing into my blog. What I'm wanting to talk about is that right now I have a feeling that I cannot overcome my last work I'm proud of. I keep going back to looking at it and wondering what was the thing that got me into making something so strong. I mean I see mistakes in it, of course, but the feeling is the thing i got captured. To me it doesn't matter if anyone else cares about it, or if they see what I see in it, I still believe that it's better than what I'm capable of. All of that should probably be a good thing, but I want to go on and improve without getting stuck to making different versions of the same picture, what I would feel like doing the most right now. Or is that - recreating one work over and over again - something that I should do?
I had this same problem some years ago, and of course i got past it but the problem is that I cannot remember how. Just making more and more, probably. Or not overthinking like I've done right now. But as I make this a problem to myself it's all the time more and more difficult to get past the picture, and it's at the same time more difficult to start a new piece which wouldn't remind the latter one.
Am I making this too difficult to myself?