First lucid bits are very much like normal dreams

I managed to make a reality check and know that I am dreaming 3 times last week (wouldn't call it a lucid dreaming). I woke up after about 3-10 seconds from excitement. Although I knew that I was dreaming and I had the control over my actions my vision was just like in a normal dream.
How do I increase the clarity of my senses (especially visual) ?

All three of those dreams were lucid dreams, since you were aware that you were dreaming. The term "lucid" is something of a misnomer, since whether or not a dream is lucid doesn't have anything to do with the clarity of your senses. Becoming lucid often does result in increased clarity, but not always. To increase both the stability and clarity of your dreams, you can do things that produce very noticeable sensory stimuli. This focuses your attention on your senses, which both increases the level of sensory detail in your dream and distracts you from the excitement that can wake you up. One stabilizing and clarity-increasing technique that many people use is to touch something highly textured. My favored stabilization method is speaking, usually to tell DCs that I'm dreaming. Although I haven't tried this, saying something like "increase clarity" works for some people.