My progress

[Liberated]

Some tips for the Beholder/tenticaly eye.
This also applies to the frog. Both are quite frontviewed,
I don't know if you have the intention of ever using them for graal,
but you would require to look down on them from an angle.

The eyes isn't quite round, neither is the pupil.

In the iris you have something going on called banding, i don't completely understand how this works yet,
but basically the fact that all the colors are basically a circled color ramp make it look bad.

The pupil is part of the eye, if the entire eye has a lighter reflection, so does the pupil.

The tentacles are hanging below the eye, I'd assume that it casts a shadow on the top part of the tentacles.
_

You should try to give more depth to your hand, maybe add a bit more contrast and perhaps play a bit with the lighting.