You may incorporate the work of others into new works; however, the use of borrowed content must either abide by fair use or you must obtain permission from the copyright holder. The submission will be removed if it meets neither of these requirements. If it does meet these requirements, you must still cite the content’s source in the submission description.
In other words, you did not obtain permission from any of the original owners to re draw their works or give any sort of proper credit for any of the references you used to create your work and this is why they have been removed.