These sigs are the results of a tutorial:
https://markcape.deviantar*****m/art/T...wmen-348238757
https://stealthy4u.deviantar*****m/art...cher-368674118
https://markcape.deviantar*****m/art/M...wmen-345047701
Basically it's the same set of resources being used in all three, that's why they're similiar.
As for the "don't be a dick" argument:
The point of criticism is to deliver your opinion to other people, so they can hopefully improve based off it.
You can do it however you want, be a dick if you wish, it doesn't matter as long as your targets receive the message.
The deal is that if you try to express yourself in a mannered way without being too harsh, you're more likely people will catch what you're attempting to say rather than labelling your post as offensive.
It's all about how much you care that your opinion is received.
If you're trying to speak to me or KillTheNoise, then by all means be harsh and painful, i'd not mind and i'm sure he wouldn't either.
However, in the case of somebody else, like O.Chaos, if you don't soften up then he'll turtle up and soak nothing, making your efforts go to waste.
Plus being able to attune yourself to who you're speaking to makes you look more respectful.
It's like avoiding to swear when kids are around or avoiding to say silly things when doing a job interview.