How to embed images?

I need to embed images onto my drupal website, but the img html tag doesn't seem to work. I have found these three modules: Image, Imagefield and Embedded Media Field.

However, the problem I face with the Image and Imagefield modules is that I have to upload the images to drupal, but I don't want to do so because I have all my images in a subdomain, and it wouldn't be very efficient to have duplicates.

As for the Embedded Media Field module, the problem is it only embeds images from these services: Flickr, Imageshack, Picassa and Photobucket.

I have two questions:
How can I make the img html tag to work? (I have full html for the input type)

Do you know of any module which I can use to embed my images? or how can I change the Embedded Media Field module to accept images from any domain?

While making the img html tag to work would solve my problem, I'd prefer a solution for my second question, because it would provide a systematic procedure to embed images, and thus would bring consistency to the presentation of all images in my site.

I hope I am not asking too a lot.

Thank you very much,

Cristian