Nice list! I endorse what MW and HOS said about replacing the Maiden's Power Sword with another Stiletto Sword or Needle Pistol. They both save you some useful credits and make sure that you get maximum effect from your Chem Synth. Alternately, just roll with a single Stiletto Sword and use the saved credits to add a little more power to the rest of your gang. Extra Little Sisters with Stiletto Knives and Stub Guns are an excellent use of credits. That's the only thing about your list that really jumps out as not being a great choice.
If you're going with what you have, definitely use the spare 5 creds to give the Little Sister a Stub Gun. Even with her BS5+ she'll hit on a 3 at close range.
The following suggestions are offered as alternatives, rather than critique.
I see that you've taken Combat Virtuoso on the Death Maiden. That's a really cool and useful skill as it both increases your effective charge range and affords you protection from reaction attacks when facing fighters w/o Versatile weapons. However, not having the ubiquitous Spring Up on your primary melee fighter means that she's a great target for pinning and may not be stabbing suckers as often as you might like.
How strongly attached are you to having your Queen as a dedicated melee fighter? Obviously, with 3 attacks and WS 3+ she's pretty good at it, but I'm usually inclined to take a slightly safer approach with the Queen and giver her a Boltgun or Plasma Gun and then a Shock Whip and possibly a cheap pistol. This allows her to still do some melee damage from the safety of Versatile range, but also ups her long range damage output, as well as saving a few credits if you go with the Boltgun.
Here is my favorite starting list for Eschers. It's not as well equipped as your gang, but it does have 9 fighters, including a Queen, a Death Maiden and two Matriarchs. It's initially focused on shooting, but adding Power Swords and pistols on the Matriarchs later in the campaign will make it extremely choppy, as well.
Escher (HoB) gang with a rating of 1000 by Psyan
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