Deadpoet said:but you must know why you like it or why not, or else, on what basis did you draw the conclusion that the picture is nice or not, right?
You're right. To me, if it is pleasing to the eye, then it is nice. If it doesn't catch my attention, then I may be neutral about it or it is simply not nice. Sometimes it is hard to put into words why I like or do not like a particular picture. I guess it's because I do not have enough knowledge to critique it yet.