To be clear....
If you own these images, I don't know why there would be a diagonal line pattern on them.
If you've purchased these images, such a pattern would not be present on legitimate purchases.
The only time I can conceive of images having such a pattern is in order to prevent copyright infringement
Perhaps I'm incorrect, so I'll provide an answer. However, be aware this site is populated by individuals who make a living via intellectual property rights (digital images). So, asking to circumvent some things can be seen as unsavory.
I find for, the most part, nothing beats manual brush work combined with other tools when retouching photos.
Most of the more automated (Healing, Cloning, Content-aware) stuff will get you so far, then using a brush and manually painting almost always yields better results for me.
In many photos the actual, 100%, real-life, appearance of objects in particular may not be absolutely necessary. The goal is a believable photo which doesn't appear to have any marked flaws.
This is rather quick and dirty (and using the small, low resolution image posted here) but I'd start with the clone stamp tool and do as much as was feasible.
Once I have things sort of "roughed in" via cloning, I'd switch to a brush and paint on a new layer...
I could probably then go in with a Healing brush to try and mimic some textures a bit more. But given the quality of the image I had, there's not a great deal to improve once a certain point is reached.
There are also a clear pattern on the right side of the original image you posted from either cloning or healing that I can't overcome not seeing the entire image.
Other tools, such as content aware and copy/pasting sections make sense for larger areas of similar color or texture. However this image has very few "broad" filled areas and I find for such images manually painting* works best.