This is a fictive Star Trek ship, USS Mitchell NX-74210. Inspired by DS9 USS Defiant style of star ship. Bigger then the Defiant, it can hold up to 125 crew members. It took around 4 months to do, in terms of hours…I didn’t count.
Update: You can now download and see 3 wallpapers in that list. Credits should go to Thunorrad for the planet texture