Two basic questions here. I know that the edge of the lapel should be with the grain of the cloth ideally.
Is this aesthetic? If short on cloth could one, if there was no pattern, just cut it at an angle?
For wide lapels, for me this seems to send the bottom part of the facing way off the grain so it's very much bias-cut. Is this correct? I don't see how you could avoid this as the lapel slants a lot more than below the button. If you swung it round to be straight you'd end up with way too much fullness.