Hi,
I understand your project scope completely and I can fix all the issues you are facing on your magento site including the image upload error, change email recipient, add payment gateway aplus others.
I am a Web Developer and Designer with having skill with MAGENTO/OPENCART/WORDPRESS/ Ecommerce/PHP/cakephp/codeigniter /MYSQL /CSS3 /HTML5, API, Payment gateway, and experience in Photoshop,UI/UX,logo, web/Graphics designing,website mockup, Twitter Bootstrap,landing page.
Do contact me so that we can discuss further.
Thanks.
Charles