I'd say you have a mix of slight but basic flaws (shading, anatomy) plus not enough refining.
Most of these pieces are rather large: I'd recommend to work on small things for a while and just push them as far as you can.
A few pointers: your avatar has short legs and torso and/or long arms.
PearKnight is mostly texture and little light source.
Fossil I'm not so sure about
I loved the metallic texture/light you gave it but I wonder if it was really intentional? because the flat bg just kills it. At best it was lazy.
Ascension has anatomy issues, an awkward pose, and the shading doesn't accord to the suggested light source.
None of these pieces is
bad, don't misunderstand me! But they're not
that good either; at least nothing that you couldn't fix with more patience.
Give your art the time you deserve!