Colours dull/muted in photos

[Kissie]

I got my A03 last summer and have never been particularly pleased with the photos, the colours never appear 'true'. It is really noticeable when comparing to others taken at the same time. Does anyone else have this problem? Is there an easy fix that I'm missing? TIA 

[Kissie]

Thank you so much for taking the time to detail this. Unfortunately, I can't get this to work on my phone at the moment! I'm going to try again tomorrow and will let you know how I get on.
Thanks again.