I never suggest people make different accounts because its already so hard to get attention on social media WITHOUT splitting an audience’s attention. You will always find one lacking in followers and likes and engagement so might as well keep it all in one place and keep your net cast wide. When you make a separate account you’ll find that MOST of your original followers will not follow through it almost never even seems to hit half for a lotta people.
Plus, if you’re only managing a couple posts a month then its best not to be too precious about consistency with content and focus more on consistency with posting which is what adding sketches into the mix will do for your main account.