I looked at your cakes and they are awesome! I really like the race car!
Keep practicing! There's always something about my cakes I don't like. I'm no professional but my friends and family keep wanting them. I've done a couple for complete strangers and they've been happy with them. We are our own worst critics.
Would you be willing to make a small cake just for him and his wife? This might help you build confidence. Whatever you decide to do, keep creating!!!!!