yes, of course . But, As you may know that Only the first ranked designer can submit entries during judging mode - so you may have to temporarily place designers in the top spot to enable them to submit the changes you had asked for - hope that helps
I like it! The C3 with the black background is cool too. Can you make the C a little more defined? Also, could you do something like what you did with the other company Integre? I liked their logo too.