Your math's off in a few places. ^^; Correcting those first, then offering suggestions...
1-2 Venomous Fang 4d (Attack [Sexy Bite], Useful [Arousal drug for her partners] Wicked Fast, Burn x2)
Burn can only be taken once, I'm afraid. Also, this part would be at 6d. It started at 10d, and you got the Attack power for free, so you only spent four dice on abilities and extras for it.
And actually, since Burn x2 isn't a valid choice, it's at 7d. Perhaps you could increase Wicked Fast to x2 and add in Awesome x2, thus bringing the part back down to 4d, but making it very fast and reliable when it gets put to use?
3-4 Strong Arms 6d (Attack [Punch], Defend [Block], Useful [Heavy lifting and carrying] Gnarly, Tough x2)
5-7 Tough, sexy body 3d (Useful [Breast feeding and Milking], Awesome x2, Tough x2)
The Strong Arms are only at 5d, rather than 6d, unfortunately. ^^; The Tough, Sexy Body has 3 hit locations, though, so it started out at 15d, and has only been reduced to 11d by the extras you bought for it.
Perhaps you could move a location over from the Tough, Sexy Body to the Strong Arms, bumping the Arms up to 10d and lowering the Body to 6d? You might want to add an extra Useful ability or two to the sexy body, too, if you can think of anything good. Hypnotic belly-dancing ability combined with one or two levels of Area to hypnotize large crowds, perhaps.
8-10 Snake body 8d (Attack [Whip and Squeeze], Defend [Curl], Wicked Fast x2, Tough)
This one is also at 11d. A Useful movement ability would probably be a good idea, as well as a Useful ability related to constricting, so that you can use it to stop an opponent from moving in combat.
And that's the corrections and suggestions I've got. ^^ Hope they help. Also, if you'd like to see a sample character that I sent to the GM a while back who seems to be rather similar, mechanically, to yours, but is a different type of monster girl...
Name: Random example spider-lady
Appearance: A sexy lady's torso and upper body, sprouting centaur-like from the body of a horrific spider.
Personality: Devious and cunning, with a strong sensual flair. The random example spider-lady seems to have taken a strong liking to her human partner, and seeks to spend as much time as possible with him.
Favorite Thing: Playing 'The Spider and the Fly'. But only when she gets to be the spider.
Way to Hide: Not used in this campaign.
1-2: Hairy Spider-legs 4d (Useful [skitter along any surface], Useful [knit webbing into other things], Tough x2, Awesome x2, Wicked Fast)
3-6: Pulsating Thorax 4d (Attack [big butt], Useful [big enough to carry people on], Useful [silk spinnerets], Useful [ovipositor], Useful [frightening red hourglass symbol], Defend [webbing shield], Area x5, Tough x3, Awesome x2, Wicked Fast)
7-8: Sexy Topless Lady-Bits 4d (Useful [womanly charms], Useful [lactation], Defend [silicone], Tough x2, Awesome x2)
9-10: Beautiful Face And Head 4d (Useful [paralyzing venom], Useful [hypnotic voice], Useful [multiple eyes], Useful [hyper-intelligent arachnoid mind], Attack [fangs], Awesome x2)
Lots of Useful abilities, as you can see, and with Awesome x2 on everything, they're all extremely reliable. Of course, at 4d, none of the powers are particularly strong...