SineWaveDrox

If the author has a Permissions section set up, you can look at that to see if they allow modifications and/or reuploads. Some authors allow others to do this without having to contact them first. If the author does have a requirement that they are contacted first, or if permissions are not explicitly spelled out, then they should be contacted before uploading. If that is they case, but they have not been online in a long time or are otherwise unreachable, then permission cannot be gained, and upload is not possible.

This can be done only with permission from the creator of the prerequisite mod. You may think that simply giving credit is enough, but a lot of people disagree. Mod authors have the ability to decide whether their mods can be used freely or not, and redistributed or not. Sure, for some, restricting the use of their assets may be for vanity, they want their mod page to be seen and noticed, but that is far from the only reason to do this. For example, let's a mod were updated to fix a number of bugs, add new features, increase performance, etc, and that mod had been a prerequisite for several other mods. If those other mods had included that prerequisite within their own downloads, instead of directing users to download the prerequisite from the source, then from that point on, anyone downloading one of those mods would be getting an out-of-date version of the prerequisite, until such time that the other mods' authors updated their files. This creates potential problems for users, encountering bugs that have since been fixed, and mod authors, potentially getting blamed for issues that have already been fixed.

For me, the choice is original Skyrim. Mainly because I do a lot of screenshooting, and ENB is far more advanced for original, so the graphics are far superior when fully modded, compared to a fully modded SE. But also for a couple of other mods I consider necessary that are simply not possible on SE.

Try the modav command instead. It works a bit differently, in that it adds whatever number you put instead of just setting to it, but it should persist and not reset like setav does.

If you want the normal version, copy the contents of 00 - Normal Version folder into Skyrim/Data. If you want the Poser Hotkeys version, copy the contents of 01 - Poser Hotkeys Version into Skyrim/Data. Allow any overwrites when doing so, whichever version you choose. Run GenerateFNISforUsers.exe and click the "Update FNISBehavior" button and wait for it to finish. Enable the poser plugin via whatever method you prefer. NMM should work for this.

It's not possible due to the restrictions in place by Sony.

That's one of the questions answered in their FAQ here.

No rule against it that I know about. People post edited shots all the time.

Two mods I can think of that have something like that are Aether Suite and Review Studio. I think Aether Suite has better lighting, but it would be a pretty huge download if all you'd want is a plain white room.

The Elder Scrolls does not adhere to the lore of other fantasy works.

That person you think is the author is not the author. You'll notice that in your post, his name was autocorrected to Banned User. He's been banned from Nexus many, many times now, because what he does is take people's followers, change the name and the outfit or something, and upload them to his site as his own. If the followers you're looking for were from his site, they were stolen from someone else. You'd be better off finding the original version by the original author. I'd try to point you in the right direction, but I'm not familiar with either of those followers, so I'm not sure where to find the originals.

Has he given permission for reuploading?

As far as body mods go, there are two general types: CBBE and UNP. There are variants of each, but for the most part, all CBBE type bodies can use all CBBE textures, and all UNP type bodies can use UNP textures (so, for example, if a texture replacer says it works with UNP, it will work for UNP, UNPB, UNPCM, etc.). My advice would be to just try several different body types until you find the shape that you like. As far as textures go, I usually take a look at all the images on the mod page, both those uploaded by the mod author and those uploaded by users. To truly achieve the type of look you see in that image, you'll need an ENB. They greatly modify the way the game looks, drastically improving the look of characters. As far as what's specifically used in that image, I'm not really sure. I'm not very good at recognizing body mods from screenshots.

I usually import the .nif to Blender 2.49b, save that as a .blend file, open that .blend in a newer blender, like 2.72, do my editing, save that as a legacy .blend, open that in 2.49b, and export that to a .nif, then adjust anything that needs to be adjusted in Nifskope.

Do you have a link to the article? Is it a bunch of speculation, or does it provide evidence to the claim? Does the article cite reliable sources?