Well, I’m working on my comps…and am not to thrilled where they are headed. I get excited about the possibilities…and then remember…I have to script it all and actual make is functional. 
Also, I guess I’m one of those artists that hates all their stuff…because I’m panicked that I don’t have anything yet that is of quality that I would want in my portfolio/ on my website representing me and my work–and that’s a little scary considering I’m graduating in March. Anyways…I just have to remind myself that a portfolio is ALWAYS a work in progress and as we personally evolve, so does our style and art…so in the mean time…I’ll just keep working away.
Either you are overly perfectionist directed, or like a lot of us, you just want to keep making things better. I know that by the time I finish a major website I don’t want to look at it anymore and there are many things I would do differently. Yet the process is often a lot of fun and challenging.
I don’t think this is about creativity or good design as much as one’s drive to be successful and to keep getting better. I hope it also means that you will feel that arrive as your work continues to grow and become more a part of who you are.
I think we’re all perfectionists to an extent, but just like you said, you gotta consider it a work in progress. Just bite the bullet!
I think the challenge of writing the code to match your design exactly is really fun, but it can easily get frustrating.