Sometimes, when I work on some designs, the everything looks fine except the overall frame (I don't know how should I describe it).
For example, see these 2 designs:
And here is how I see them overall, respectively:
I don't think it's just with me. Something must be there, because it happens sometimes, not every time.
So what's the basic reason of it? And what things one should keep in mind while designing so that such things do not happen?