I found this AMAZING program for sketching called Mischief. It has an infinite canvas to work with so exporting files is…involved at least since I haven’t figured out the best way but other than that this is an amazing program for sketching out concept art.

You can get a free trial and a totally free version here https://www.madewithmischief.com/

This is how I see a certain alien species I drew a long time ago now. They look a lot different and that’s probably a good thing.

These guys can get HUGE; kaiju sized and yes those Mech designs I posted earlier? They are sometimes used to keep these critters away from cities. Not even just to fight but to communicate with them as they are a sapient race.