helo!! i did an art style study of someones style, and was wondering if i could post it or if it would be copying/stealing? i tried matching my art as close as possible to theirs, so would it still be allowed? i honestly dont mind if its not, i would just like clarification ^^

my apologies if this is already written somewhere or is common knowledge!!
by the way, i dont know the original artist, but would try to find them and credit of course.