Using smoke and mirrors
Sometimes, the research just isn’t enough and it’s impossible to get clear reference for something you have to draw. At that point, you can use smoke and mirrors. Well, mostly smoke. Obfusticate, use debris, make the inking slightly more scratchy, use shadows… any trick you can. The reader won’t question something that they can’t see. If you decide to ‘wing it’, you can guarantee at least one reader will spot the error.