As a special education teacher I often work with students who are ELL. One website I reference regularly is https://www.colorincolorado.org/. This website is designed for teachers and families who have ELL students. This website has an amazing section on how VTS can be used to improve ELL students comprehension. I highly recommend this website especially for anyone working with ELL students.
I work with special education students as well and found this site to be very helpful and informative. Being that my population includes ELL students I will be using these to better align my lesson to address that as well.