Perhaps, it would be nice to elaborate on the current features and limitations of OGA. From the current project description it is not immediately obvious what does OGA have already. Hence it is not obvious how and why the goals are choosen.

IMO, generally speaking, currently one can interact with OGA in 3 ways:
submit an art piece, search for an art piece, and communicate with other members via forum, art comments, etc.
An registered account allows for some customization of these options, such as ability to track own submissions, ability to organize art by arranging it into "collections" and so on.

"game project pages" and "artist features" goals fall into account improvement category.
"more art categories" and "game ready art certification" - into search improvement category.
"version control for art" - into submission improvement category.
Since you want to make living from OGA, there is another set of goals to
monetize it ("swag store", "supporter accounts", "better paypal integration").

Speaking of current features (and regarding "more art categories" goal),
it would be nice to mention current art categories and provide screenshots and
links to some of the most prominent pieces, a couple for each category maybe.
Besides, a screenshot of the OGA main page definitely won't hurt.