Weh.

[Vipershark]

I'm kinda surprised this hasn't been pointed out yet but it's pretty obvious that this front facing sprite is simply a copy of the 3/4ths perspective one on the right but mirrored, pasted together, and slightly edited to look like a single sprite.
...not that that's a bad thing, but it wasn't done entirely correctly.
For example, Wario's face looks super weird.
Rather than looking like a face, it looks more like two mirrored faces leaning into each other and melded together in the middle, kind of like this:

...that's a really bad picture but it should illustrate my point.

You're gonna want to edit Wario's head so that it looks like an actual head from straight on. The chin and bottom lip in particular look super awkward because Wario's cleft is two pixels wide (due to the two halves being pasted together) when it should be one, making Wario currently look like he has a separate mouth on each side of his face.
In general I think he looks maybe 1-ish pixel too wide, so it might take some slightly more major edits to fix the uncanny valley effect that he's giving off right now. The body looks mirrored as well, though it isn't as obvious and I'm not sure what, if any, edits should be done to the arms but they're clearly mirrored as well.