Of course. The new version only exists because of the original. Derivatives should still be credited to the original owner. Of course the person who made the new version can add that they changed it.
For example, as a landscape blogger myself, I tend to edit some of the photographs I upload. My method is to use the click-through link as the Flickr/500px/ect of the photo. Then the caption linking to the photographer/picture, sometimes with a little an added text saying [edited]. Then I leave the “source” as blank.
By leaving the “source” as blank it will autofill after two reblogs (first one says it they reblogged from you so tumblr doesnt do it for that one) The autofilled version will go directly to the post’s page on your blog. Which is also where your caption and clickthrough is displayed. Providing full credit to the photographer, while still having your blog in there.
(If a photographer says you don’t have to credit them, you don’t have to. Example being if you purchase it for use on something)