What is normal good lighting?
How many lights are the needed amount?
Depends where you're riding, and the amount imo is 2 front and 2 rear minimum to allow for failures. There also has to be an element of what an individual rider is comfortable with.
From the pictures you've posted yours more than meet a good standard.
Living in a country town I have to allow for street lighting and pitch black country roads.
I get seen well enough that people dip their lights and react properly from behind. Varies a bit according to which bike and where I'm going, but I combine dynamo and battery lights (diversity against any failure), and a typical set for mixed riding is CYO60, Hope V1, plus a little omni electron on the front, two Smarts on the back plus a Toplight, with one Smart flashing. The V1 comes off for lit road trips. One thing I don't like with that setup is the way the Hope just cuts out when the battery is low, not a problem if the CYO is on.
If I have a bike at my mother's (Cheam, South West London) it's much the same as for the mixed riding, although the roads in London are lit I like the Hope on to show up against some of the very bright lights around. (Central London is the only place I use the Hope in flashing mode)
Everywhere there are drivers who don't behave properly to cyclists and those who just don't look, day and night, but with the lighting I use none without a serious sight defect can really claim I'm difficult to see.