uhm did you say in your deviant art description that it was made in GIMPshop ? if that is the case it is sadly not a vector a vector is a image is made through programs like photoshop , inkscape / ponyscape ( user made version) , and adobe illustrator with formats such as .psd .svg .svgz ( compressed svg) or .ai i believe that the image you have created to be a raster image in the pony art style. if gimpshop does not support these file types that sadly the images is only a raster how ever this image has been well done it looks show quality but you forgot the nostrils wich is quite bad but overlooking that it pretty good