I was wondering if it is possible to create an upload function to upload picture through my own site to the gravatar site?
First, you'll need to Sign In to your Gravatar account. Click on My Profile in the top bar. Click on Websites in the left side menu. You can add a link to any site by clicking on the "+" sign above Add Link.
Gravatar uses your email address to provide your image to other sites. If we don't have any record of your email address, Gravatar won't be able to display your image. Your selected Gravatar must use a rating that's permitted by the other site. Lots of sites restrict Gravatar images to G or PG ratings only.
Head over to Media » Add New and upload your custom default gravatar image. After the image is uploaded, you need to click on the Edit link next to the image. WordPress will now open your image for editing. You need to just copy the image file URL and paste it in a plain text editor like Notepad.
Yes, this is possible. See http://en.gravatar.com/site/implement/xmlrpc/ , specifically the grav.saveData or grav.SaveUrl calls.
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