From that, if open the stylesheet, there should be a style called "calibre5". This should have the size of that image. There will probably be a style like that for each image.
A hack would be to double or triple the numbers. That should increase the size, but if you go to big, it might not all fit on the page. You could also try removing the height and changing the width to "100%". I that will put the image full width on the page and adjust the height proportionally.
And that gets to pretty much the end of my knowledge on this. I'd have to experiment a lot. Either someone with better knowledge will wander along, or ask the question in the ePub subforum of the Workshop. The experts reside there and can tell you the best ways to do this.
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