Some states uphold post-mortem rights for celebrities. You may want to ask your IP attorney whether this would apply to your fact scenario.

I am using Disney characters in my graphic art but it is not direct replicas of the characters in films. Is that copyrighting?

You should contact a copyright attorney in your NEO area (there are many good ones) to help you address whether your work is a derivative work...

This is a fact specific scenario that requires careful evaluation of your own IP attorney

BOUGHT A DESIGNER LOOK ALIKE DRESS FROM CHINA.

Your fact specific inquiry should be decided and answered by your own IP attorney

Can a agreement in a email hold up in court for trademarks

This is heavily fact specific. You should contact an IP attorney in your area

Can a simple permission letter get you out of a law suit and abusing someones trademark/intellectual rights to there product.

You should contact a trademark attorney in your area to address these fact specific issues

Is it possible to use priority date of Provisional Patent Application if I file Design Patent within a year of filling PPA?

No. See MPEP 1502.01(G) - "Utility patent applications may claim the benefit of a provisional application under 35 U.S.C.119(e) whereas design...

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In your Reply comment to Pam's answer you indicated that the mark has not yet registered. You said your new question is "will this be approved by...

Do i have to get permission from a famous person to get their picture on a shirt ?

Absolutely. Do not plan on making any shirts unless you also plan on defending a lawsuit.

Can I sell digital facial expression caricatures of high profile celebrities online?

Yes you would likely be facing both federal claims, as well as state claims. Contact a Florida IP attorney.