There's not many places to get reliable critique beyond paid drawing courses, honestly. People are lazy fucks in that regard, because it takes effort and usually only pays out in the sense that the
victim artist might take it to heart and try to improve. :v
Anyhoo, i'll try leaving my personal tastes out of this:
There IS improvement through your gallery, and that is good. However, it'd still be cool to see you experimenting a bit more. Almost EVERY SINGLE character you've drawn in there is staring straight into the viewers soul (or in two separate directions); it wouldn't be so bad if it was just kind of a sideways glance, but in many cases, the viewer is not an important part of the image itself. You can think of it as a bit like a shitty live-action sitcom: The actors usually look at each other while the laugh track is playing at their
hilarious antics, but will also sometimes glance into the camera for comedic effect. Facing the viewer directly is a rather situational thing, and most certainly shouldn't be the default state. So, long story short, try turning the head around a little.
Also, poses. Try out some new ones. While it's good to see that your newer drawings are starting to unglue the arms from the torso, there are still more poses than "limp arms" and "waving at viewer". The latter is vaguely more interesting, but ultimately they both bear witness to a lack of thought about the pose, or perhaps even avoidance. Proper posing can be hard, but oh my goodness is it ever important, because it breathes SO MUCH LIFE into a drawing.
Your latest piece is the best one for sure, and i'm starting to see what might be the beginning of your personal style, BUT! DO NOT REST ON YOUR LAURELS. Cartoony or not, hair doesn't sit on top of ones head like a wet sponge (unless you explicitly shave away all the hair beneath your scalp), and the pose is rather tense for a guy sitting in a couch.
As a final note, EYES. In reality, eyes almost always cross a little, unless you're a shellshocked veteran sporting a thousand yard stare. In cartoony styles, it's great to exaggerate this crossing a little, because that really helps with making it look like your characters are focused on SOMETHING.
It really doesn't take all that much.
also obligatory
Andrew Loomis recommendation because that book is great and also yes keep practicing of course