You can try promoting your artworks seasonally. Like I post Chrismas relate things around the Holidays. Since you live in India you could try to promote Ganesha paintings during the Ganesha festival and Krishna Paintings around the relevant festival. These are just a few suggestions about
For the promotion of sketches, you can use your insta, FB or your blog where you can promote your artwork. The other ways which can also include Such as sending random emails to the people. But donâ€™t spam your audience. You can promote by the building your portfolio. You can promote by a strong presence on the internet. By selling your art in the online store. BY joining in the art competition in your city or the nearby city. By giving ads in the newspaper. Or by making publicity by doing some unique painting or some individual work.