Admiration is a difficult feeling to be sure you’re portraying correctly. Without wanting it to lose its weight by overdoing it but at the same time trying to find some sense that your projection of it towards someone else has landed and isn’t too subtle. 

The other problem with admiration is that although one may feel it so strongly for another, that other may not value that admiration as much as intended or enough to pick them up. 

Another issue may be that if one feels other things towards that person they admire it may appear to undermine that admiration. Say… finding someone physically attractive- if they know you feel that way will they see this attraction as belittling how much you respect their values and fundamental human beliefs?