ui - I would consider that manipulated photo of yours pixel-art.
There are no signs of it not being made entirely out of pixels like smooth diagonal lines, its actually 100% pixels.
And you kept it within a 4tone color palette so it could possibly be put into a ROM and used on real hardware(well a 128x128pixel section of it could be put into GlitchNES anyway).
I think it looks rad.
And it would be hard to argue that its not art made entirely out of pixels so therefor it would be considered pixel-art even if its not 100% drawn by hand.
I have respect for artists who choose to draw entirely by hand but I also have respect for artists who find creative ways of doing things like using copy/paste to their advantage, manipulating photos, using other advanced techniques, modern tools and software, and drawing inspiration from other artists and their artwork.
Even on occasion a "retooled" stolen piece of artwork can be very beautiful and inspiring.
Try to have an open mind and an open heart.
We all only live once.