The 18-year old Japanese attacker joined the Gunners in January this year but was immediately sent to Holland to further his development in a first team environment.
Upon his return to North London this season, Miyaichi has now played twice for the Arsenal seniors including Tuesday night's 17-minute cameo in the 2-1 win over Bolton in the fourth round of the Carling Cup and he feels the experience in the Dutch Eredivise has benefited him greatly.
"The real shock was the difference in football between the Dutch league and the Premier League. It's a big change in level so I feel I need to get used to the style of the game here.
"I have been learning technique, tactics and physicality, and there have been a lot of new things over the past few months.
"I believe in Arsenal and know that I will get better as my time here continues."