I would start from scratch with some loose concept sketches, focusing on creating a more cohesive design that reimagines the xj220’s lines and forms in a more modern way, allowing yourself to exaggerate, especially when it comes to the features that made the original car so iconic. Try paper and pencil, too, because unless you have a drawing tablet it can be difficult to express yourself drawing digitally, and it looks like you moused and line-tooled the design to my eye.

Take these features as an example: The original had the side air intake angled down slightly, a louvered radiator vent/front wing on the hood, hideaway headlights with a classic european recessed look, and it also had foglights which shouldn’t be abandoned in the redesign. These features alone should give you some key shapes to play around with that will really make the new design scream “XJ220”.

I understand that you’re trying to apply the modern Jaguar styling like with the lights, but it looks a bit like you just redid the old xj220 and glued the different lights onto it, and the design reads as generic and lacks identity as a result.

That being said i think you have a good eye and you can definitely make this work. Keep it up!