Is this right?

[Lehrrapa Swirä]

My internet has been down for like the past week, and over that time I tried learning the grammar of Na'vi.
I just wanted to know if this sentence is right? Please tell me what i'm doing wrong 

Oel teraron atswal ioangri

Sorry if this isn't in the correct format 

[kewnya txamew'itan]

The -a- always points towards the thing you're describing, here you're describing the creature as tall so it should be tsawla.

Also, there is no topic here really. You ought to use -it instead. The topical is only really used in long discussions (when there is a topic) and in a few set phrases, in short, non-set phrases like this, it should be avoided, here the accusative -it should be used instead. Lastly, if the topical were to be used, it would be -ìri, not -ri because ioang ends in a consonant, ng.

[Lehrrapa Swirä]

Thank you, i'll try to remember all that next time!