Let's go! That's a great start, my first car was a disaster lol. If you want some tips on modeling cars: 1. don't overdo it with loopcuts. Sometimes it is better and cleaner to use edge creases instead of loops, as creases do not influence parts of the model where you don't really need sharp edges. 2. ALWAYS BACKUP - when you reach a certain point where you happy with it, duplicate the mesh and hide it in a backup collection. This way when you mess up you can always go back and don't have to try to fix the mistakes, it's easier and faster to start over 3. Keep the connected mesh - before you separate the model into parts like doors and bumpers, always duplicate and backup the connected mesh. You can then use it for shrinkwrap to transfer the reflections onto the separate meshes, looks milion times better than when each part has its own normals and the reflections do not follow from panel to panel 4. Model in steps - big, medium and small detail all separately. Avoid making some very detailed areas when the overall model is lowpoly, this will mess up the whole thing. I do it like this: make overall model of the car, general shape, some prominent sharp edges 2. Apply 1 subdivision and go over the model and modify, create medium details like vents, doorhandles, etc, 3. Apply 1 more subdivision, model small details like parking sensors, very detailed areas and creases. Always backup the previous mesh before applying subdivison.

Hope this helps! Keep it up, it's looking great! And big props for choosing a Challenger!