I dunno, you'd have to watch a tut to know what to do, but it's not too strange a workflow right? Basically you ended yo make sure you've actually created a document the painting is going to be saved out too right? Still blown away by that Bastion fanart that someone posted in WAYWO a while back, that was completely…
Aligning like that is actually super easy in Blender. Just type sx0<Enter> (for example; to align along the Y axis instead type sy0<Enter>.) To remove stuff from a selection you have a few options. Shift+Right Click will unselect something if it's selected. Circle Select and Border Select will unselect stuff if you use the…