I think like most artists, I started by sketching a lot of my favorite characters from movies, shows and comics. I still do it to this day on the rare occasion that I have some free time.
I love tabletop games. I don't play warhammer 40k but I love art and the character designs. Here is a Spacemarine punching an Ork in the jugular.
Another Warhammer piece:
This was an older piece of Stitches and Nova for a "Heroes of the Storm" contest from a while back.
Ryuk from 'Deathnote"
And then some fun Dungeons and Dragon's fan art. Note: When the DM just leaves treasure out unguarded, it is definitely actually guarded.