Yes, Serkan, the same happens to me all the time too. There is always some detail that I oversse and then, when I see the iamge, I wonder why I didn't see that when shooting.
The details and the light/toning are very nice here, Serkan. So the atmosphere of a rather solitary moment under the shadow of the umbrella is conveyed very strongly, as the distribution of light intensity decreases from the top to the bottom. The other umbrellas as they are spread over the place add also much to the image, expept for that one at the bottom left, which I dared clone out on the attachment. It seems that many times such small things somehow manage to get in the image quite unnoticed.
Perhaps also getting a bit more of the bottom parts could help here, for letting the other umbrellas "breath" a bit more freely?