I believe @Jaguar.force has a point about citing the source but it is beautiful what you do to the images and I believe it is 'transformative' work so it may come under fair use in copyright law.
https://fairuse.stanford.edu/overview/fair-use/what-is-fair-use/
You should not let this one criticism make you leave Steem. Having being in my own heated discussions with Jaguar I don't think they are going about their mission in the correct way. Especially when it scares away real artists.
The area of copyright law has gray areas and your artwork fits that profile.
Yet another another charlatan that doesn't know or pretends not to know plagiarism and copyright law are separate concepts. We detect and report Plagiarism: the uncredited use of other peoples work/ideas, which is a type of fraud, it just happens that a lot of the time plagiarists infringe copyright law, but you can plagiarize something that is, for example, in the public domain and in that case you wouldnt be infringing copyright law. Hence, defending a plagiarist under the fair use doctrine, is completely missing the point or at worst being intellectually dishonest.
Within the context of the steem platform, where content is rewarded, the foremost important concept is plagiarism although technically speaking the TOS of all the front ends like steemit require you to respect copyright law too. It is very interesting to note, that when asked to cite sources this "real artist" decides to leave, it would almost seem as if the user considered that her artistry requires fraudulent practices like plagiarism to impress. Transformative art is great, but keep in mind that in order to be able to assess the level, degree and quality of the transformation you need to be shown the original, if not how can you appraise the transformation? It appears self evident that this "artist" relies on the hidden nature of the original work to impress, for obviously if she thought showing both the transformation and the original would make her look better she would do it. Instead what we get when asking for sources is: "I quit".
Which speaks volumes about whats really going on here, to those that have eyes to see.
This is not a grey area. This was a photograph taken from this site, how I understand it: https://www.kasiawojcik.com/bizuteria/srebrna/kolczyk-bold-01-silver,119
A friend of mine is a photographer. I know how much energy and time it takes to make a good picture. At least, you are dealing with living humans, you invite them to a real location, you use your physical effort to get to the place where you shoot. Afterwards you rework the pictures digitally on the computer, alter them until you are satisfied with your own standard and try to sell them for customers, websites, artist-magazines, fares etc. etc.
Now you come and say to the photographer something about a "grey area".