Sure, you have some Chinese friends or teachers, even if not, you can always find native speakers in only lessons which is not expensive, or find a language partner. Then ask them directly what do they think about your pronunciation, do you have a strong accent and so on. Perhaps this is a pretty hard and a little embarrassing method. But none better than the Chinese themselves will not tell you what is the difference between your and their pronunciation. Even if they answer that everything is fine, insist on your own, ask what else you can improve. Their answer will tell you where to move on and what to work on, besides your Chinese friends can also help you with this.