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I am not  sure that whether Google checks for the design of the website for its ranking or not and if it checks then how does it count ?  But one thing i can say that it counts the user experience. If you think that your design is providing a good user experience it is OK but at the same time if you have same template as other website have and a user visits both the website he would be confused and it is not a good user experience. So decision is up to you what you wants to give your user confusion or clear Precision.

Did you tried some other images to add same time. If you did and got same error then it is not issue with Panoramio but if others get added and only panoramio has problem then probably it is quite possible that Google is not accepting images from Panoramio as Panoramio is getting better popularity than Picasa.