It's a subjective thing to tell something about correct pricing/value.
I usually try to get some general sense of the market place and the going rates, however it doesn't make any sense at all (sometimes see extreme good work for almost noting and sometimes see less good work for insane prizes). I guess one can love his own work so mush he considers it priceless, on the other hand some make priceless work and consider it worth noting.
However in your case there are some models out there that almost have the same level of details/art stile and include texture cords + nice textures and rigging for around 100 bucks. You probably need to take that into consideration, but this is my pure theoretical brain simulation speaking, reality is something the brain cannot fully comprehend.
If I need to buy a model I would go on different sites to compare the findings. Things I consider are the total package versus price and art stile (if it has something less but more form something other etc.)
Usually the art style with this sort of things is decisive, but jet again a very subjective thing.
I have a snake robot model that probably took me way less time to produce, it goo's for 150 bucks and sold 8 times (on different websites). I guess it has something to do with the art style that has a certain appeal for use in music video openers and that sort of things. So if someone is looking for that sort of thing he would pay more because it just fits what he is looking for (makes for greater value in his perception).
This doesn't work with everything;
For example, my Roborob model seems to fit noting, no one needs him, it seems only me loves him and values him (not sold ones).
It probably has something to do with personal sentimental value. Roborob was one of my first models I did in the early beginnings back in the days of 3ds max 1, I was amazed by my own creation and it motivated me very mush to keep doing 3D (my little Pinocchio, still love him today, almost pity him).
It kind of hurts my feelings to see him standing there crying for 50 bucks "and then no one wants him", he's kind of priceless to me. (maybe somewhere in the future I'll 3D print him and shake his hands).
No one can guarantee that something is going to be a best seller.
You see, value is a very subjective thing (it's influenced on the one end by cultural motivations and influenced on the other end by personal motivations).
For example, some art paintings are total carp but get sold for 60 million dollars because the previous owners happen to be persons who are considered special. Value is something that people do within their perceptions (place a banana in front of an ape "next to the painting" and the ape would most certainly go for the banana instead of the painting).
So you see, you don't necessarily need to ask "the pro's" to determine the value of something, you will automatically find out what people value in their perceptions (which is a mix of culturally and personally based doctrines).
Some people for example gravitate towards subcultures with their own art styles and beliefs, they would value main stream art less, they would preferred to consume their own sub cultural stuff instead.
The thing is, that it is within power of one individual to start a sub cultural movement that goo's beyond himself and out into the world (the culture).
(it's a strange ghostly practice the human perception, never forget it is something you are doing, it's all make believe)