[Answered ]-How do I show a form and 2 inputs to upload multiple images in the template and in the view?

Now that you have separated out FotosCarro and Garantia as their own models, I assume that Carro can have more than one of each of these. This means your form needs to be a bit more complex. To include "subforms" for related models in the parent form, you can to use inline formsets. This will allow you to upload images for multiple FotosCarros and Grantias for a single Carro.