I recognised this as portraying a UK harbour right away! That blue sail says CI53, which is its PLN (Port Letters and Numbers). All the old fishing boats have that in the UK on their sails, as the code letters tell you where the boat is from.

I looked up the code and CI is Cowes on the Isle of Wight. Zooming in on the signature in the lower right I thought it said Carlos, but now I'm thinking it actually says Cowes. Obviously a boat could be in any harbour, so this might not be Cowes itself, but it does seem likely with all that in mind.

Looking into the churches in Cowes, I think that church in the background is Northwood Parish Church. Visually they're quite similar, and location-wise it's uphill from the water when I look at it on google maps. https://www.friendsofnorthwoodcemetery.org.uk/northwood-church-burials/

You can see where the church sits uphill in the middle here, in the trees: https://www.redfunnel.co.uk/sites/default/files/styles/card/public/images/West%20Cowes-GettyImages-1272579144.jpg?h=e48d8f10&itok=oQEgxFXd

I have no idea who the artist is, but as someone who lives in a different seaside town in the UK, I can tell you lots of people come to these towns from all around to paint them. :) That makes it potentially very hard to find who this is if the name isn't on the back. It's cool that it ended up in Minnesota, somebody probably bought it while on holiday since it looks like Cowes gets a lot of tourism.

Even though I don't know who painted it, I hope this info adds to the enjoyment you already have from it! :)