/ic/ - Artwork/Critique

The 2016 drawing is 1 year old, took me about 40~50 minutes, and i used the eraser a lot (mostly at the hoofs).
The second one, was a sketch that took me 10~15 minutes, i almost didn't use the eraser.

But instead of improving, i think i got worse. I try to do new things, but i always fail. The 2017 version i did a pose and handplaying that i normally don't do.
I want some criticism about my style and how i should improve. I don't draw because i enjoy it, i draw because i want to show what i imagine, but it's very frustrating because all i can do is these boring, uninspired women with the same position.
I don't put my signature on them because most of my drawings give me shame. If i used reference for positions and such, would i improve?