good attempts, I suggest you put them on a background that makes them distinct.

it's fine since you're doing it to look NATURAL but being creatures of the world, their color is naturally blended to camouflage to their habitat.

so to make them striking, you might want to consider some change.

number your photos to make it easier to refer.

among your photos, i like this one............

RyoKenzaki some what, but your white BG seems overblown la.

in fact not necessarily to go white. just something that shows some contrast against the subject would do. meaning like say match black vs light brown, or match brown vs black or lighter brown.

think rocks and dead leaves - you know scorpion habitats. you can find rocks with less messy colors (eg grey mix to match black, brown scorpions), wood (eg driftwood, dark brown to match lighter brown scorpions) and dried leaves (lighter brown, to match black scorpions).

good. btw arachnids ah, what you should try is go to the front and snap their head. awesomeness if you can macro!

not necessarily need full body shot. you can just shoot the scorpion's stinger if you like.

as to snap without shadow, how la? the fella so close to the ground. what you can do is diffuse the light.

i don't think he can get a good shot of that without any MACRO related add-on.