The orginal question was,

"It is allowed to use several photos of other artist's works to photoshop them togetherand create a montage picture that is listed as "*their" art."

The answer is an resounding NO.

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But I have another, more interesting question. What about using use several stock images to create a work, and then enlarge the resolution and replace all objects with your own materials, 3D generated or drawn by you or bought by you, whatever.

After that the finished composition contains no copyright material, but can say to have been "inspired" by the original images.

Is that ethical? (that it is legal can be in no doubt)