You asked for Harley and PG stuff. Again, like I said here>>115254621
there are two arcs with Harley and PG. First is in Harley book New52 (2014) issue 9-13 and second is separate run Harley and Power Girl (2017). The second one is kinda part of the first arc because in the first our girls are sent to another galaxy by two villains, they have advenures there whule trying to come back home and when yhey do they are instantly sent by those two villains again to yet another galaxy but they are back one panel later with different clothes saying that was tough 2 weeks (on Earth it was like 20 seconds). And the second arc is about those 2 weeks (20 seconds of Earth's time).
First is pretty much random shit like most of the Palmiotti/Conner Harley books, the second one is little less random, more Lobo style book and that means it's better.
If you ask about solo PG run, read 2009 PG of, again, Palmiotti/Conner but thus time there's ni Harley so no random shit nor cheesy jokes and since Conner ilustrated herself some of the issues, it looks really good, because she is a good artist (OP's pic is her - it's cover of the issue 1 of this run). You should definietly check it.