Very nice!
I honestly really quite like this model and paint style for several reasons;
1.) The punchy colour of the reds on the pipes and the lava adds good vibrancy to the model and makes it feel more chaotic (although I do think this is because of either the white balance or the CCD in your camera at the time was defective)
2.) The burning cracks and lines in the lower armour plates of each leg makes it feel much more like it's stampeding through towards the enemy, great Hakanor's Reavers attempt.
3.) You've shown good attention to detail through the grey highlighting on almost all the black areas which is good practice for painters.
Few things I would say you could improve on could be;
1.) Happens to lots of us and doesn't become apparent either until the end of the paint job or near the end, but mould lines; Flash. It's hard to not see it when it's such a pronounced part of the miniature (front right claw (stage right))
2.) The dynamics of this miniature are very typical to the standard positioning of a defiler. To make it seem more alive, animated; I recommend trying out different poses or perhaps holding an enemy in it's claws to show it's in battle?
3.) Contrasting colours are good but what makes them great are complimentary colours. Although this paint style is set as Hakanor's Reavers, bright greens and blues are much more pronounced when put with such vibrant reds so green eyes or light blue energy (not too much or it will lose the effect) could really bring this model out more.
All in all, great colours and some good attention to detail but I would recommend more time in preparing the model before painting, wet blending and adding tiny dots of more colour.
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