very interdasting anon. this is a depiction of the earlier forms of isis where she is usually winged, hence the winged disc on her forhead. it wasnt until later that she was depicted with the bull's horns and sun disc on her head after "absorbing" for lack of a better word the role of the godess hathor. the veil to me represents the obvious occult (hidden) meaning of her which no mortal has yet been able to lift, and expose her.
the tray in her right hand with three what ever they are alludes me. i cant find any other depictions of her with that. but what did catch my eye were the three items on the tray, and her three fingers used to hold it up. notice her pinky is purposely obscured. her accentuated breasts represent her role of fertility/feminine. the classic ankh represents "life" or bringer there of.
the two birds heads on her throne look more like falcons than owls to me. probably to represent her son horus. they "Y" head beneath her feet is probably actually meant to represent the feminine , its the shape of the female reproductive organs, and appears to be emitting some kind of illumination or light, giving life, knowledge etc. its flanked on the left by what appears to be a crescent moon impaled by something, attaching it to another celestial body. probably earth. the symbol to the right kinda looks like a bulls head but its hard to make out. could be a representation of her later depictions and roles in ancient egypt.
and finally the two water lillys depicted at the foot of her throne are probably the white water lilly as opposed to the blue water lilly, which blooms at night. im making this assumption based on the moon symbolism. also notice that the lilly is flanked by two leaves. the third 3 to go along with her right hand and what ever she is holding.