It looks like a mixture of different styles. Where's the cohesion?
Are you talking about this particular set of covers? I don't know, but it doesn't look that different to me..
And why is Jennifer in most covers so "ugly" (personal taste)?
Well, I guess it does come down to individual taste, but I personally don't think Yennefer should be depicted as exceedingly beautiful, 'with love in her eyes and flowers in her hair' . I mean, it's not exactly a fairy tale so I don't think it would work. But it's just my personal opinion
Yes it is. But AS in interviews sometimes use term Pentateuch about Ciri. He doesn't care about different characters.
I suppose he simply refers to "the pentalogy", excluding the short stories (heresy!). But I wouldn't say he neglects the other characters, it's just his famous "the plot", "the plot", "the plot"...
Btw, the "pentateuch"... I wouldn't expect anything less from Sapkowski than to consider his work as the Bible