User blog comment:Mobo85/An Interview with...Phineas and Ferb's Aliki T. Grafft/@comment-5151799-20110924184142/@comment-406459-20110925214209

Thanks, J.Severe! I'm guessing that's just an early model sheet, which is why it has the old logo- if you look at the other model sheets Aliki has around her and what's she's drawing, it appears the photo was taken during production of Across the 2nd Dimension.