Do you have a portfolio where you display the original and new version of the logos you have fixed?
No sorry. So far I only did one job that can be regarded as
simple logo... fix it.
This logo:

the guy wanted the logo the same. no fixing - only better quality and slight changes allowed...
I change to:

attention :
THIS IS NOT a good example of my service... i want to critique bad logos and improve them .
You claim to have done 3.