Hair style that let us look good is difficult

Today I went to the hair salon to cut my hair. Then my wife said "I recommend you don't look good short hairstyle, so let you cut hair a little". I did as told, but I thought it is so difficult for me to know the hair style that let me looks good.

Actually I'm not interested in my hair style ( so clothes is). So I always order " make you look me good please". In other words, I round throw the way because I dislike to think it. 

Is it not good for me? To know the way to let me look good? I think if we are not interested in it, we maybe try to think it, and round throw it. Do you think it is not good?