I'm not going to mince words here, so if you don't like constructive criticism, then please stop reading now.
I really like what you did with the firewarrior. I makes the model look a lot more dynamic and engaging.
The paint however has not been applied with patience and attention to detail. Your primer spray wasn't properly shaken until the paint was mixed and it created a very gritty surface on the vehicle. When the can says shake for two minutes, it really means shake for three minutes just to be sure that the paint is mixed thoroughly.
The rest of the paint is too thick in some area's and too thin in others (Especially the red).
Slow down, take your time and use nice even brush strokes to make sure that the paint doesn't "blob up". Red is a color that you must be extra patient with. It will take many coats of red to paint over a black surface. Attempting to put as much thick, red paint on as you can in one pass will only result in a bad looking finish.
Again, I'm not trying to insult you. I'm just hoping to give you a little technical advice to help you improve.
A forum community dedicated to Wargamers, Wargaming 40K enthusiasts. Come join the discussion about Warhammer and Wargaming collections, miniatures, tactics, terrain, reviews, accessories, history, displays, models, styles, scales, reviews, accessories, classifieds, and more!