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There is no perfect way to deal with this. Some ePUB readers do not support links at all and many do not support automatic back functions. There are a couple of choices.
Provide both a link to the data and a return link at the beginning and the end of the note to return to the text. Works well if only linked from one source. It is also possible to provide a page number. ADE at least assigns a distinct page number to the eBook and this can be used with built in Goto function.
Provide a link to skip around the note and set the note apart from the main text in some fashion. This way, those that have readers that don't support links can still read it. People that have links will be able to skip it if they wish and no return is required.
Which you use, I think, depends on how important the note is to the information. It may be that the author expects people to read the note, in which case, setting it apart but remaining in the flow would be appropriate.
As to your image question the size is really the only negative and generally images are worth the price of increased size to the document. There is no reason to have 8 Megapixel images however, and many readers will not support images this big anyway, even if they can scale them down. One and 1/2 megapixel will suit most readers and 1/2 megapixel may be fine. Most eReader have screens of only 800 x 600 pixels and even the large screens are only less than 2 Mega pixel in size. Keeping the images small will keep the size of the book small.
Dale
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