I'm not the best artist in the world. I know that. My Essential Tremors make sure of that. I do the occasional sketch in my school note binders, but nothing really interesting.
I mostly do recolors and splices of existing pictures. Most of the pictures I make of my Pony OC are Rainbow Dash recolors with lengthened hair and added accessories. I see no reason in uploading those pictures because they are not completely original. There are some who have apparently been fooled otherwise, but if they were to ask I would tell them that they aren't truly. The character is orginal, not really the pictures.
Should the urge ever hit me, I may digitize those notebook sketches that actually seem worth the effort. One of which is what I would envision to be an air elemental. Though it may have bits a pieces that have at some point been seen elsewhere, at least the drawing is original.
TL;DR: Recolors aren't original. Recolors with modifications are somewhat original. Original works are original.