I have been looking for one for awhile.
I had Windows Photo Editor which did some good basic stuff, nothing fancy...but apparently Windows discontinued that software.
Adobe Photoshop is probably one of the best out there, but it is expensive and can be challenging to learn.
You might also ask your question on the
Photography board those folks are "professionals" and can really help you out!
I've been trying to resize the images you posted in the other thread. The reason you haven't been able to use them as avatars is because the file size is too big. I was able to reduce the file size, but the images were a blurred mess. I'm still working on it though!

I may have to recruit some outside help...