I like it! As the previous poster said, the Dark Eldar and Space Marine parts need to be camouflaged a bit better though. Imperial Guard accessory bits are your friends here. If you can find any players at your
FLGS who will trade you for some, or sell them for a few bucks, do it.
Jakara- Good start, but the place where the legs connect to the torso looks a bit awkward. Some accessories placed on the waist like they're clipped to the Jakara's belt would cover this up and help the models come together better. I recommend grenades (
IG or
SM) if the Jakara can carry them. Some pouches would also work. The heads of the right and left one also look a little Eldarish. This can be tricky, since
GW makes almost no female heads that AREN'T Elf or Eldar (when I wanted some, I had to get another company's). Just be sure to file down the ears a bit. Also the feet, which you already know about. I used
FW feet for some of my traitor guard vets, and I found that a little bit of green stuff on the ends to make a steel toed boot look worked well.
Malcadons- I like the gauntlets. Other than that, however, they look quite
DE. Again, some
IG and
SM accessories might help. Also, on the leftmost figure, whittle off those spikes on her legs and she'll look a little more human assassin and a little less
DE.
Orrus- Try sanding off the big Imperial eagles on the two male Orrus's chests. They're a group of clandestine killers pursuing their own self interests, not servants of the Emperor. File off that stray purity seal too, for the same reason. It'll also make them look a little less loyalist
SM. I also think adding some extra wires all over their suits with guitar wire or green stuff would look really good. Remember to file the ears on that old
DE head too.
Yeld- Probably the most
DE looking of the lot. I'd file off those leg spikes, and add some tech bits from
IG or
SM models. See about adding some human gun bits to their arm guns. Scopes would be perfect, if you can get some. Possibly consider a head swap, or altering their helmets. The big thing here is that you don't want people mistaking them for
DE Scourges.
Matriarch and Patriarch- These are my favorite models of the lot. The Matriarch looks a little
DE, however. I'd whittle off the pointy blade/bone thing going through her ponytail and file down the ear tips, if they're visible. Then add some
IG/
SM accessories wherever they look good. Like the Orrus, the Patriarch needs that eagle filed off. Then give him whatever flashy add-ons you can to make him look like an imposing
HQ. Good luck making those mech arms! There are lots of Necron, Tau,
DE, and
SM bits you could use.
Keep it up!