Little free advice, 90% or more of the final outcome will be dictated by the scanner itself.
All scanners are not created equal, just like any other electronic device they have many specs and for best results on what you are trying to do you will need a decent scanner with good optical resolution specifications.
I for example have a all-in-one deal printer/copier/scanner and the scanner is crap (they all generally are on those), no way a High Quality image could be made from a scan produced by it, no matter the graphics editing skill level of the person doing it.
It's fine for scanning documents and such but that is about it.
When I used to create scans, I had a much better standalone scanner to do it with but they are not so cheap.
Just making you aware of the scanning pitfall most find themselves in, where after many frustrating hours spent trying to clean up a poor quality scan, all the while thinking it's their own lack of experience/knowledge, only to eventually find out it's the scanners fault.
Also just to be clear the physical size of a file has nothing to do with quality, for example a file could be a 100 megs and still be so poor on details as to render it unuseable for anything.
Simply put, image quality cannot be determined by any numerical attribute in a file, only the human eye can determine quality.
Which is why sites like this have a "upload approval team" and files are "physically looked at" before they are added to our gallery here for download or they are uploaded by those in approved designer groups which don't require approval becasue they have proven over time that they know what a high-quality image looks like.

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