Since you're all artists here, I figured you might be good to ask, although I'm not sure if this is really supposed to be in General Discussion or on this forum at all, but I don't know, there might be something to learn from it.
I co-run a website for general entertainment, and one of our newer contributors submitted this-

Along with the description-
This is a piece I made in art rage using the paint brush options right after the Yoshi's Island Super Replay final episode. It took me about a week to make, and I'm still not satisfied with how "mushy" everything looks, but I feel it's still worth showing off.
Now, anyone who knows how to scale an image probably knows what interpolation looks like, and long story short it's just this-

-scaled and filtered.
But he insists that he used it as a guide and painted over it. I didn't buy this for a second, but the problem is that I'm not comfortable taking action until I'm 100% sure that he's not being honest, and right now I'm sitting at somewhere around 99%. So if any of you can just confirm that it's scaled and filtered and not painted over (if it seems ambiguous, look at the angles that the scaled verison makes, especially noticeable on the large spikes), then I think that'll be enough.