Hiya, welcome to deviantart ya so-cool Undertale fan!!
I must say that your art-style looks really great and I love how you draw the skeleton brothers! ; v;; I think that more people def deserve to see your great artworks and I just want to help you out getting along in this site! There is a great way to publish your art before a lot people - and it's by joining groups, or rather, Undertale groups!
When you join then, you get a lot of undertale art into your inbox that is drawn by other artists, which is really cool - and you can also of course, upload your own artworks there! That way, more people will actually see it and will favorite your drawings! c: That's even better than tagging your artworks themselves, and I just want more peiople to see your art, so you could get nice comments on them!
Scroll up to the top toolbar of the website, you see the button "More"? put your mouse over it and then click on "Groups"! On the groups page, you can search for Undertale groups by writing "Undertale" in the search bar! But since I'm an Undertale fan myself, I'll reccomend you to join these groups [Just write them in the search!]: "UnderTaleFans", "Undertale-club", "Undertale-fans" and more that you can find by searching "Undertale"! These groups I wrote down have more than 5000+ members each, which means your art can get really popular if you keep publishing your art in groups too! It sure helps me even though my art still need big improvements ;v;'
I just hope it'd help you because I want more people to see what a cool artist you are, and I'm sure many people like seeing art of the skeletons! I hope thatr tip helps, and if you need any other help or just wanna talk about Undertale, then don't hesitant to message me!! I don't bite ; v;; Enjoy your stay in DA and have a wonderful day!!