Next update is planned to be a mix of moving plot forward and some more camp stuff.
Wind magic will hopefully be in it, earth may be a little further off depending on how that girl's intro turns out.
I too am eager for art! Ina and Maya have sketch previews up on patreon, they voted for Ina next so she should be in the next 1-2 updates but Maya is also incredibly cute and will come ASAP after Ina. MSam I have to do some more work for, but I am hoping to get him some content and art in the next few updates.