Shows real promise
The coloring and art were great. The animation was limited but with strong artwork that isn't such a bad thing. Obviously this is just a few test pieces, so naturally the next step (if you want to take it) is to tell stories by putting those pieces together.
If you're yet to tell a narrative with a series of pictures and sounds, it can be a lot harder than you think but anyone with your artistic chops probably has a very good head start. Bringing living, breathing, thinking characters to life that will do your bidding is a seriously rewarding hobby and one that I suggest you give a serious try now you have the tools to do so. Start small, see how things go, and best of luck.