Why do I see my OS X account picture in GMail on my Android phone?
1) As you clarified in the comments, you have used your GMail account for instant messaging using Adium. My guess would be that Adium took your OS X account picture (or you assigned it manually) and synchronized it with Google. It should be easy to verify this by changing your contact picture in Adium.

I can`t test it right now, but will try later and also try to come up with a solution to turn of the synchronization.

2) https://ssl.apple.com/support/feedback/

But I don't think that OS X has anything to do with it, since I believe that the updating of your GMail avatar was done by Adium.