It's-a Me! Mahhrdeeo!, Some Mario sprites, & other characters

Alright, so I made these sprites a few weeks ago, I deciding to post them in the wip section because I'm not sure if I'm done with them yet, and I know there's more I can change or add to the sprites. I already know I should probably change some of the poses that are just copy+pasted since that was a cheap method to finish the sprites...
I also have an idle animation for Luigi, but his movement is more Human-like then cartoonish. (But I haven't saved it as it's own image, or saved it as an animation yet)
(If anyone want's to know why I put "Murphyo" instead of Mario, it was because of that old puny in Pmttyd that misheard Mario's name.)

Instead of making another topic, I've been working on a few character ideas, and a design for a boss as well, so I'll just post it here.

I decided to make 4 different versions of the boss since I wasn't exactly sure how I want the boss to stand (on all four feet, or two). Although the bottom 2 are my favorites, since they would probably be more easier to animate.
I added the other characters so I could image what a boss fight could look like with him.
The character next to the blue robot is mostly one of my friend characters (they designed them, I changed it around for them), and the guy who looks like they are a Madness characters is one of my friends characters.
I haven't named 2 of the characters yet though... (the girl, and that pink puffball)
If anyone cares about the names:
Top row, left to right, Illusion The Mimf (where my name here came from), and Adam.
Bottom row: Fail-bot (with a backwards "F" for no reason), Brian, The Milkman, Joe.

So any suggestions, help, or comments would be appreciated.

I like it.
Not half bad.

That's Mahrdeo alright. Interesting style.

Look more like mspaint drawings then sprites.

Awesome style. It's just the pipe that needs a bit more work.

Awesome style. It's just the pipe that needs a bit more work.

To be honest, the pipe is the only good looking thing here.

Its okay. I personally don't like the style and I think the line arts aren't vert good. There a little too thick. Good job anyway though.

Well rather then saying that it doesn't look as good as it could have been, could you give me a few tips of how to improve the sprites and make them look less like drawings made in paint?

I know they don't look too good, but I think there some of the best custom sprites I've made in a while, and I'm mostly satisfied with the outcome of them.
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Thanks for the help and comments guys, I might try making some of the lines less thick (although I kinda prefer them that way), also I'll work on the pipe a bit more.
Although I'm not sure exactly what's the problem with the pipe, but my guess is mainly the shape of the pipe... (I'll probably go look for a reference so I can improve on it)

Great stuff

I aplogize i was a bit rude. What your doing wrong or atleast what it looks like is, that your spriting with the mspaint brush. You should be using the pencil. the palletes aren't to bad, but more contrast and a few more shades would be nice.

I won't say they're bad, but I won't say they're exactly "good" either. You've got a bit of an original style going, it just needs some refining. A few perspective errors and deformities are really the only problems here, and I think they should be easy to spot if you look.

But seriously, you have an original style here, and I like the pipe and burn sprites.

Keep spriting, you'll always get better.