These are the primary ezines I read- none are “subscription” but you can support any of them!
Two Coats of Paint (be sure to check out their gallery guide).
There are also some good blogs you can follow:
13 Ways of Looking at Painting
Structure and Imagery
And these Instagram feeds are pretty good sources of abstract painting, too:
1 Million Diamonds
Use Artsy! It’s really that simple- you can track shows, get updates on new work, and buy pieces. Most of the artists about which I’ve written can be found there. And if they aren’t, let the team at Artsy know!