What time period?

[Crispvs]

As Magus says, the combination of Imperial Gallic type 'G' helmet and Corbridge type lorica sementata puts you fairly securely in the second to third quarter of the first century AD. As far as I know, your canteen is of a type which has yet to be found in pre-third century AD contexts and there have been suggestions that they may be oil flasks rather than water canteens but they do seem to be very common amongst re-enactors. My own is a pottery one.

It looks to me as if your tunic is rather narrow. A realistic tunic should be as wide as the distance from mid-forearm to mid forearm when standing in a cruciform stance and should hang at least to mid calf when unbelted. It should be square or a wide rectangular shape like a pillowcase. There should be no need for sleeves as the shoulders of the tunic will naturally fall over your upper arms to create sleeves.

I notice that your armour is an Indian produced one as well. The hinges on the shoulder guards feature upstanding modern style hinge tubes rather than the flatter Roman style tubes. At some stage you would probably need to replace these therefore, if you are wishing to have an accurate portrayal.

I hope this helps a little.

Crispvs