Two strong observations in your videos- The sound of 'w'. The lower lip and the upper teeth do not meet while saying words beginning with the letter 'w'. The lips are rounded and the back of the tongue is naturally raised. However, in your videos the sound of 'w' is that of 'v'. 'Riot' is not a homophone of 'right and write'. Its phonetic transcription is different to the other two words and so is the sound of the vowels.