We allow clients some limited amount of bespoke assets so the images don't have generic feeling. Two or three max per image :- ) But depends on budget.
Actually, to not waste time, we also searched for similar boots or some to start with but didn't find anything. All the available collections (like Evermotion..3DsKY,etc..) provided very generic, ugly models. I have no idea why these outfits create so much stuff when few high-quality, high-styled models would be much better. Just like DesignConnected, but too bad they only do furniture :- )