With a VERY GOOD piece of advice:  

 DO NOT MAKE EXCUSES. 
“That’s a character of my own design, his head is supposed to be lopsided.” “I drew that page on two hours of sleep.” “My dog died and I was upset.” “That was with my LEFT hand.” WHATEVER. Stop. It’s not helpful. And editors HATE excuses. Trust me. They’re right and you’re wrong. Take the note and, in future, work to fix it.
How you take that note during your review is a sign to the editor WHAT IT WOULD BE LIKE TO WORK WITH YOU. Make THAT part of the portfolio review EASY on your reviewer. REMEMBER: NO EXCUSES. Your work IS what it IS. TAKE THE NOTE.

(Bolding and italising mine. Read it—and MEMORISE IT. I’ve been amused more than once to see Ty reviewing someone’s portfolio—and to see the kid’s face when Ty says what needs improvement, as he starts eyerolling because he KNOWS how great he is and how dare Ty Templeton criticise him.  And Ty is famous for his portfolio reviews—a friend who is an artist/writer once told me that he regards it as Ty’s “super power”. He’s kind, thoughtful and considerate—but he absolutely tells it like it is. He tries to always find something positive—and I have been surprised more than once that he’s been able to. But Ty always tries to find a positive spin, but he also says “here’s what needs work”.

But there is always someone who will announce that a negative review is because the editor/artist was jealous, nervous about the competition, bitchy, etc. etc. DON’T be that person. No professional artist is nervous that you’re going to be walking up to an editor and instantly getting that artist’s job. Any artist willing to do a portfolio review is going to be a thoughtful, caring person who wants to share what he or she has learned, and give a helping hand to someone else, just like they got at some point in their career).

**No editor or comic book pro is going to read your scripts. Don’t take scripts, don’t try and drop them off. What you need to do is find yourself an artist and put together some mini-comics, and get THOSE to editors. Get yourself known on the ‘net with a webcomic. Wait for them to ask you for a script or pitches…