Thanks for the inputs which are unique and interesting
#24 is a little extreme . the 'i' looks like it is falling down (like a set of dominoes) and this would not look good for the main objectives of ortraying certification, standards and authority. It looks a little fragile.
#23 is much better and interesting. The green might be better with a more bold colour to make a difference. You could try red, blue, orange, purple - whichever you think might work well. the certification mark need to stand out on white paper - the green gets a little lost.
Thank you for comments and feedback... I'm uploding few new versions...a lighter one with orange..a blue one which i think is common but safe and one with new letters and purple probably the most serious looking.
After further reviews by others, the consensus seems to be that the design whilst overall an interesting concept will in fact be a little confusing with the changes in lowercase/uppercase etc to be used in a certification mark.
We thank you for the design inputs, which are very creative, but sadly we will have to reject them based on tha above comments