I think greater vividness in dreams is a step in the right direction, which is a promising precursor to lucid dreaming. If dreams are more hazy, likely awareness is low, and thus chances of lucidity lower. Although I have in the past occasionally become lucid in dreams that were hazy, and then the vividness suddenly improved, so that's possible too. I remember some lucid dreams that started in realistic settings and I noticed something off, and others that started in a setting that was not realistically at all (for example: a dream where I was in a mansion which I believed was my home, but suddenly I realized that in waking life I do not live in a mansion), so there are no hard rules I think. When in doubt though I would interpret any change in dreams as a progress toward lucid dreaming if possible, because believing that increases chances of lucid dreaming.