You are a game developper. But you aren’t a graphic artist and build sprites is very hard for you. Don’t panic, i will show how to find and download free sprites. Just ask.
Some websites presenting free sprites game download. Yes, it’s possible de build html5 games without to be a graphic artist with this great databases. Now, you can animate you game sprites.
From 80-90’s game platform like NES, Sega, Atari or Commodore, you can build with html5 your own game remake. That’s a good training for developpers.
You’ll find sprites or skin that you need to make your html5 games. Very simple.