your pronunciation is really good, especially 谢谢（thank you）. x in pinyin is very difficult for most people when learning Chinese,but yours is very good. the tone of Chinese is also OK.if the high part of the second and the fourth tone can be higher, your pronunciation will be better and if you don't mind, I'd like to offer some suggestions of your pronunciation bdg in Chinese is similar to птк in па та ка in Russian, and ptk. are similar to those not followed by vowels（like p＝суп, t＝нет,k＝банк）.j in Chinese is similar to д in тётя, and r it's softer than ж in Russian. when pronounce a in Chinese, your mouth should be bigger than you pronounce a in Russia. for example 妈妈 in Chinese needs being more clear than мама. ваш китайский язык отлично！