A published book has seen many interventions post the author's first draft. Better to get these under your belt sooner rather than later and go out looking dandy when you show your work to the big guns - the agents, publishers and readers. For that reason, all insults, slurs and calumnies should be most gratefully received at any point between second draft and twenty-second.
Order of merit.
Choose your moment. You should never show your work to any other living soul at first draft. It is horrible. You don't want funny looks at best or those you respect to foreswear ever reading your work again. Show it when the second draft is complete. (I only fully understood my story and nailed my title at the end of second draft this time, fifth novel.)
Choose your first readers wisely. After the second draft is done, show...