I will agree with tamlin but would like to add my own thoughts.
Often times when someone is new to digital rendering, they lack the eye/experience to see and detect the small things that make a difference. the larger the change, the more they can notice the effect. sometimes that over-effect is misinterpreted as the desired result.
my friend tends to way oversharpen his images.
only with experience comes learning.
to further my point, open up one of your own images from waaay long ago when you were really begining. back when you were proud of an early hack and paste job.
now, look at it with new eyes. I'm sure that you see many things that you would do better or different now.
(certain people will not notice this effect. thats ok, theres nothing wrong with you, it just means that you may have topped out or you have a big ego and cant see your flaws. dont worry, we can help with that
)
some people are just "color ignorant" like my wife. perfectly able to pass a standard colorblindness test, but she cant tell the difference between red, rust, and brown.
its like they are lacking varients in hue to her. all one rusty color she says. some darker some lighter. its like she is "tonedeaf" in that part of the spectrum. (to mix terms)