While the presentation looks great, you'll need to add in some character-driven aspects of the storyline as well. Perhaps a new, younger commissioner or highlight some owners or players. Basically just add some story into the mix. A post-pandemic world offers many possibilities to explore. Literally just reading the headlines on ESPN gives plenty of fodder on what an altered league history could look like. Like what happened to spark a league-wide redesign and what are the new rules in effect moving forward as a league? I think you can really dive into those aspects. If in doubt you can consult the guidelines here or post a question. 

That being said, some thoughts on the designs. A small initial nitpick, is the rear jersey numbers should be bigger than the front ones. It's your choice, just something that always bothers me on presentations. Haha.

Dallas: With this story you have a chance to fix all the bad things about Dallas' color scheme and this one is still all over the place IMO. I think if you focused on the look of either the home or away and built a full redesign around one of them it'd feel much more complete.

Philadelphia: It feels a little plain. I think some sleeve striping would do wonders with the TV numbers up on the shoulders.

Washington: I think red sleeve cuffs would look better on the away.

NY Giants: You could use this opportunity to craft a matching home/away set. But obv they're pretty iconic as-is, albeit very plain.

I think if your trying to go from today on, I think using the current NFL uniforms would be a good idea, then starting next offseason you can update any uniforms, considering all brand updates that were slated to happen this offseason have already happened.

NFL Relaxes Guidelines

Ahead of a potentially shaky season, the NFL decided to relax the rules regarding the one helmet as from today, teams would be allowed to submit their own alternates that may or may not be retro themed, the Jets immediately jumped at the opportunity and discarded their disliked all black set and bringing back their 80's/90's themed kelly greens whilst the Packers brought back their 1950's look back with the gold and kelly green uniforms.

Commissioner and Owners Prepare for Reduced Season

The owners and the commissioner having already confirmed the decision that there won't be any International Games this year which put Shahid Khan, the Jaguars owner in a bind regarding future profits from the UK; they are also prepared to not have a less than profitable season despite the new stadiums in Inglewood ((Rams/Chargers)) and the Raiders moving to Las Vegas.... Stan Kroneke is also facing a potential lawsuit from St Louis that might bring the NFL back down to ground zero.

Players prepared for potential loss of season

The NFLPA has told the media that they see a potential reduced season should coronavirus numbers rise up again, with potentially some matches being played behind closed doors... all players involved are prepared to go to make the most out of it.

Unfortunately, your images for the NFC North aren't appearing for me.

I can see them but I can't go to the source file, seems some permissions are off with Google. You might try Imgur instead for hosting the images.