I think this phenomenon has a lot to do with daily sodium intake and the associated water retention that it causes. Typically, I've noticed that before going to bed if you weigh yourself, it might be normal to be carrying 3-5 pounds of water weight. The next morning, after voiding thoroughly, you weigh yourself again and most of that water weight is gone. Likewise, you stand in front of the mirror and your body composition looks more lean as a result of carrying less water deposits that blurry your superficial muscles. In medical terms, I think it's what they would call EDEMA to some extent. Patients with congestive heart failure tend to have edema accumulate and develop excessive retention of water weight throughout their lower extremities. I am not saying you have edema Bhank, merely pointing out the likely phenomenon behind the pictures. I also do think your lighting is better in the second picture, but certainly the grooves/cuts between your abs are more pronounced.
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