This is 25-year-old Esther García López based in Albacete, Spain. They were (until recently) a freelance artist who often shared their work online.
However, more often than not, people will liberally share artists' work without attribution. (Just ask any self-employed artist online about this.)
"By doing this, they are making it more difficult for people interested in our work to find us, and therefore, losing chances of getting a job," López explained.
"For someone who lives [off] occasional commissions, it's vital that every work we share has a proper credit."