The most important are the two tags in your case, if you're drawing
First you add post and give tag
drawing
Second importing tag its
art
then you add as many tags as you can and it's up to you what they will be, if you want to change the tag, edit the post and replace the tags by removing one and adding another like drawing.
PS only you can not change the first tag is the only flaw because steemit has already attributed your post to this category, remember the first two tags
drawing then art
the rest of the tags you add what you want,and always upvote your own post, everyone does it because everybody upvote is important!!!