I think the differences in gradients from the front fender, door and rear quarter make all those panels appear not to line up. The door scoop is not very well defined - you sorta can't tell what you're looking at. My last note is the front "splitter" or spoiler on the passenger side looks blurry ... or soft. Not like a solid object. These are all pretty little things but the rest looks pretty solid. To me, these are common GM (or whatever they call it in Inkscape) problems. Cars are made of smooth solid objects and a lot of them SHOULD be mirror reflective. Meshes aren't always suited to vehicles for that reason.
Gradient Mesh ... I'm not familiar with Ink Scape so I'm not sure what it would be called or if there is a similar function but it looks like it. At least, you've done a few things on this car that can't be done with standard linear or radial gradients. Anyway, keep up the good work. I hope to see more.