While in some ways I do agree, fanservice/porn is a large part of shows such as this. Afterall the anime itself started off as heavily ecchi-like lol
Theres many other Witches who also need more artwork but the main problem is the franchise as a whole has been slowly dying these past few years even in Japan. Many previous artists had jumped ship to more popular franchises long ago, Kancolle and GuP filled that gap when SW was lacking official content for many years. Its even more a shame that even though the series is technically making a come back, its most likely too little too late. I love the series extremely much, but it would be foolish to ignore such things... that's just the way it is sadly, my stance is to enjoy what new content exists because its better than nothing at all!