One of the accepted pattern traits for a Sambava male
is that it will have a "U" shaped bar that runs
down from the dorsal under the lateral line of the animal
then back up towards the dorsal without a break or partial bar
below shoulder running up from under the chest
until after the "U" bar is complete.
I hope ty doesn't get upset at my using this image of Loki:
http://www.bluebeastreptile.com/images/TYLER/Sambava/LOKI10-29.jpg
There are also color differences
and some other morphological differences that can be debated
at this point and are difficult to relate to someone new to the species.
but the "U" bar is the most easily seen and objective determination.
You should also be aware of the fact that there are many hybrids out there
of mixed local origin that may have a "U" bar but in conjunction with other traits
that someone with more experience will be required to view, access and weigh.
[edit]
I just saw that pict.
yeah it seems mostly sambava if not completely from that local.
it's difficult to tell because the pict isn't all that good.
two of the bars are merged but you can't tell if they continue at all.