Time to greet the fresh meat.
Try and use the same medium when creating a drawing, unless you're trying to create a desired effect. For example Lucario - it's obvious you've changed what you were using to draw for his hands, and I'm sorry if you were trying to create some kind of effect but it hasn't worked for me this time.
Posing: Look at Lucario's pose, it's too dull! He's standing, front on, facing us with his arms against his chest. He isn't moving, he isn't using a move. Even his face is completely deadpan. Try and incorporate some action and facial expression into your pieces, especially facial expression as this can sometimes make up for a lackluster pose.
For posing, take a look at this
grid: Now, imagine it overlayed over each one of your drawings (it may be useful to actually lightly sketch one in future). Where these lines cross, is where the eye's focus is naturally drawn, so this is where you should put the main focal points of your piece, discerning features such as props, faces, limbs etc. (I have no evidence to back this up, I've just heard it repeated in different places and choose to use it myself., that's not to say you should follow it religiously, you don't have to cover every focal point if it compromises the composition of the artwork.)
Also Lucario's head looks like it's been drawing from straight lines, did you use a ruler? NEVER use a ruler when drawing, especially on something in the foreground; no such thing as a straight lines in nature.
Looking forward to seeing more, keep it up!