First of all when using another artists work, one has to credit or used the word "inspired" followed by the artists name.
Van Gogh died 24th July 1880, so his work would be in the Public Domain and therefor not subject to copyright, even so when not copying a complete painting. then "Inspired By" is usual and a good idea.
The first painting is Van Gogh's Roses - They are white and being Van Gogh was a Post Impressionist they would come across with an abstract feel.
I paint in an impressionist style but not Post impressionist. I have tried to keep faith to how it looked, but I added some pink to the roses. the painting I have done is abstract but different than the original - Not everyone likes that style.
Second Painting is inspired by Van Gogh - Starry Night.
I am using 8 inch x 8 inch canvases so this was quite a challenge. I could have used a larger canvas, but wanted both paintings.
Yes it was a challenge -Some leave out the conifer, I did not but half size which also being a small canvas means building not correctly to scale. I took that licence and did it anyway.
Sorry for long intro, with these, it was probably needed.