Ooh, they're nice, but if you're going for the terraria-style, there's something you're missing. Your black outlines does not fit with the style, as they're more coloured, like a darker shade of what it's outlining. You should also work on making your shading a little more dramatic and visible I guess.
Other than that, it's ok. Got some nice ideas in there c:
Keep up the good work and have a nice day~