They're good. But the original comic colors are better.

Which are...?

I agree with Time and Space, totally, and Reality cause it stays left. But I think the Power Stone should be orange, and Mind purple, wich leaves me with yellow for Soul. I think red would be a better fit, but it fits better to Reality.

Red power

Blue space

Green time

Purple soul

Orage reality

Yellow mind

Like that, too. Better than the films'. Especially that new colour, "Orage". Sounds cool.

This shouldn't be mean, I'll take it out if it offends you.

Nah it’s fine

Why, in this photo, is Iron Man beeing reflected in the Soul Stone? Shouldn't it be Nat or at least Gamora?

I feel the colors are fine.

Space works as blue, imo

Mind... maybe works as white... I don't know

Reality works as green, imo

Power can be purple, though... but maybe something more dark like... black...

Time could be purple, more than power

Soul works as red, though... it would be symbolic, as well... the proccess to obtain it, would require blood shed.

Black and white are just bad colors to be in it.

Well... black and white are not colors, so maybe you got a point there.