I think your artwork looks good and well rendered. I like the posing and lighting. I would've prefered it if the guy looked a little older though. Not much, a couple of years would do. I think you're going with MILFS for the women in the game, see if you can get a morph to add a few wrinkles. Again not a lot just to make them look slightly older. I think it will help with the realism of the game. But the models look nice either way.
One question I'd like to ask you is: do you need a world map? A lot of games want to make an open world game but don't have the content to fill said open world. This will lead to dead feeling worlds and/or your players hunting for content. There are games that need an open world (management type games mostly) and that is fine. I'm just asking you to review why you are going open world and if that is the best fit for your game. The game I have in preproduction at the moment will not feature an open world for the reasons above, even though it is going to be an extensive game (hopefully). Again this is a question to you. If you feel your game needs it then no problem, just way the pros and cons.
Lastly it seems English is not your first language. For me decent enough English is very important in a game. I'm not a Grammar N or anything but it needs to be near native to be easy for me to read (I'm not a native speaker either). I will actively avoid games where the English is too hard to read. Try to get a partner who can translate the game for you. (You even decide to start out in your native language and later translate the game into English.)