BLK Pride Apparel stole copyright artwork from dmitrimarkine.com and used it on their commercial twitter account to advertise their website. As no legitimate companies steal images or use them commercially without payment, it's clear their website not legitimate. That also can be established as of January 23,2017 their website has no contact information aside form the form,
Here's the registry of their website:
A representative from dmitrimarkine website reached to BLK Apparel notifying them of the infringement, which they ignored. Unprofessional and inexcusable behavior!