Ideal image size for single page with sidebar

I have been looking everywhere but couldn’t find the information…Sorry in case I should have found this somewhere else. But what is the featured image size for a single post with side bar (right), i.e. what is the maximum size in which the image is illustrated? Or is there a size guide for all images for the Fashionistas theme?

After uploading the images they usually lose quality and I am hoping to solve at least part of the problem by uploading the images in the required or ideal size.

Thanks so much!!!


Images that are used there are resized to 640×250px. There is no image size guide for Fashionistas theme.

Please feel free to ask any other questions that you might have.

Kind Regards, Roman.