You did a marvelous job. There is nothing wrong with using poses hut you do need to credit the original artwork. I know you still drew over the bases from the original work but what you did still requires talen which you proved you have so dont be ashamed to admitthatyouused references. Everyone starts out that way. Keep making lovepy art and pract7c8ng and one day you wont need base poses but in the meantime be honest and definitelty add the reference of the original artworks because its wrong and against policy not to.