You probably already figured it out already (seeing as how this post is over a month old), but someone told me that using Photoshops unsharp mask tool help when you resize your pics to make them sharper.. weird, aina? Unsharp to make sharp? It works though... I haven't done it on the older pics I have, but all of the newer ones I do it on.

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no actually i didn't figure it out yet! thank you so much, i'll give that a try.