This is an Artist Trading Card (ATC/ACEO), which means the original painting is slightly smaller than the scan: 2,5x3,5 inches or 6,4x8,9cm.
This card is for seYca
. The rat and the small wolf are his original characters from the 3rd chapter of his German fanfiction "Painwolf", in which "Rat" tells little Hiru about the world outside the laboratory which he has never seen: fav.me/d2p52km
. I have litte experience in drawing wolves and rats, so I hope I didn't make too many mistakes
Also, I had only a vague idea of what an animal laboratory might look like, so I looked at lots of photos of cages, tables, medicine cabinets and medical bottles. Don't ask me what the glass with the bubbles might be - I think it looks nice and I'm going to let it glow, to make the drawing more interesting
(After all, it's a fantasy story anyway.)
Here's he uncolored drawing on which you might be able to make out a few more details: fav.me/d7bej9s