Firstly I'm going to say that your render could show off your model a lot more effectively, crop out the wasted space on the sides, use a subtler gray instead of the black background, I'm guessing you're using a light tracer/skylight (given you're using max) try adding 3 or so omni's with 0.3 intensity with a murky brown colour, a red and a blue either side, or whatever the equivelent in your 3d software, this will show off detail and look much nicer.
The model itself looks like it's got a lot of potential, here are some criticisms I have; the thighs are completely straight, they should be angled and look a bit thicker at least, that goes for the knee too, the pose is way to stiff, even for the modelling stage. The helmet doesn't look accurate to a Tau battlesuit, it looks close but not quite iirc, the arms also look too short, lengthen them completely, try having the bend put in, you'll probably be able to see it better in comparison to pictures of the model itself as they all have bent arms. The jet pack on the back is also very blocky and from memory I recall that they taper in at the bottom towards the back, there is also a large Tau emblem on the side that you could add. The torso section is too squashed, the top bits or 'pecks' should come down a lot lower over the abdomen which you've improvised, the crotch area is also larger and more curved than on your model. Furthermore there is a radio antenna on the helmet of the battlesuits, you should try adding that to both sides of the helmet, don't forget the tracking device mounted on top of the guns
, this is looking at the old XV88, I don't know if you're basing it off a forgeworld model or something, but hopefully some of these things you can improve on.
But keep working on it, is it subd at all?