The 24-year-old, who was born in New Zealand, put his country ahead in the clash at Twickenham, before England stormed back to record a 38-18 victory.
"You can't be negative. You've got to be positive. There were heaps of positives: scoring tries and staying in the game. But you've got to look at the things you need to work on. There are a lot of things that we need to work on, let's be honest," Maitland told reporters.
"It's just a shame we didn't do the jersey justice; all the boys are very disappointed. Things have gone really fast for me. I've only been here for a couple of months. To be playing Test rugby for Scotland is a dream come true.
"It's just the start, hopefully, for me. Going back home to Murrayfield is going to be special. Hopefully I get to play and experience Murrayfield for the first time. I've still got a lot to prove to the people of Scotland, getting selected having not been in the country for long."
Next up for Scotland is a clash against Italy on Saturday.