I’ve been developing and selling a lot of skins since the launch of the feature, so here’s my feedback and some of my experience 
First of all, you can’t know for certain how the market will react to a specific design, but you can look at other designs and try to fill the gap. For example, if some ship has only dark skins on Paragon Hub, it’s worth trying to offer a light one. That’s my main philosophy. Maybe I’m wrong, but it worked for me so far.
In theory, it’s good to base your design on something recognizable, in this case it’s Amarr Empire. I have created and sold many designs based on both in-game and out of the game things (Game of Thrones, The Expanse, The Boys, Altered Carbon,…), but I’ve also noticed that abstract designs are selling just as good. Of course, I have a couple of design that failed completely and I’m stuck with a stock that no one wants to buy. Expect that to happen as well, it’s just a part of the design business.
The best way to test the market is to build the skins and offer them. If you are not sure whether it will sell or not, it’s best to do it when CCP has a production cost discount. Winter Nexus had 50% off on PLEX cost for building skins. I suspect that the next discount might be around Capsuleer day (the 15th of April).
Oh… and take a look at this thread: 👁️👁️ SKINR / SKIN design showcase - show off the ones that you like
Regarding design that you’ve posted, here’s my opinion (only my personal opinion that might not be relevant and might not reflect how the market would react ): Dominix and Minokawa hit the spot for me. When I look at them, I can say “Yeah… That’s Amarr“. The other two - not so much. My thoughts are that some ships are simply not made to have Amarr design, but that’s just me.