Sorl thumbnails VS Google

May be it's a stupid question, but i can't find an answer.

Using sorl thumbnails and inspecting the page source i notice that images are coded in html in the following way:

    <img src="/media/cache/c7/73/c7737259a2760e164a61c8ac9d3df59f.jpg" width="187" height="280" />

but here

http://support.google.com/webmasters/bin/answer.py?hl=en&answer=114016

"The filename can give Google clues about the subject matter of the image. Try to make your filename a good description of the subject matter of the image. For example, my-new-black-kitten.jpg is a lot more informative than IMG00023.JPG. Descriptive filenames can also be useful to users: If we're unable to find suitable text in the page on which we found the image, we'll use the filename as the image's snippet in our search results."

So i can't understand if i want to have a better ranking, it is better to not use sorl for this kind of images and use

    <img src="{{ pic.picture.url }}" width="{{ pic.picture.width }}" height="{{ pic.picture.height }}" />

that gives
    <img src="/media/images/pics/productimage-picture-ccf-iveco-4.jpg" width="187" height="280" />

instead of

    {% thumbnail pic.picture "280x280" as image %}
    <img src="{{ image.url }}" width="{{ image.width }}" height="{{ image.height }}" />
    {% endthumbnail %}


Is this reasoning correct?

Thanks to all

Kooliah