I made this illustration based off of a series of sketches I made the other day. I'll put the original sketches at the bottom. Most of this was done using Adobe Illustrator. I made a layer for my lines to make a digital sketch. Then I added separate layers for colors, shadows, highlights, and a few layers of effects made with the brush tool. Most of this was made with Adobe Illustrator but I made the background in Photoshop and added some drop shadow and outer glow to the creature. I also used the brush tool in Photoshop to make some extra details such as the reflection spot and the tiny faded red veins in the eyeball.

Same thing but with a more simple background.

Just the background.

These are the original sketches that I built the entire piece off of. I did 15 quick sketches in 30 minutes the other day and these were the only 2 sketches of the 15 that I actually liked. The mouth looked like an eyeball to me, the "fangs" looked like an iris, and the 2 white inner top teeth looked like a reflection spot on a pupil to me... so I immediately had the idea to mirror that to make eyes. Then naturally it made sense to have the reverse for the mouth below it.