Sadly I cannot find a good quality version of these twopictures.
Edit: The link to the first is unavailable now so here is another (It's of Wanko, Hoppou, and AAC Hime). Also I can't find the picture of Henderson and Senkan in this video at all. In this video at 3:03-6:02 the second picture is shown in it as well and in good quality, so it has to be somewhere...and at 6:03-10:47 in said video there is another official artwork of Senkan that I can't find.
The official art is very small so I'm not really sure, but it's nice to see the confirmation that the black things under Battleship Hime's collarbone are horns and not tattoos.
Sadly I cannot find a good quality version of these twopictures.
Edit: The link to the first is unavailable now so here is another (It's of Wanko, Hoppou, and AAC Hime). Also I can't find the picture of Henderson and Senkan in this video at all. In this video at 3:03-6:02 the second picture is shown in it as well and in good quality, so it has to be somewhere...and at 6:03-10:47 in said video there is another official artwork of Senkan that I can't find.
Found the first video's image I believe (if that is what you were looking for).