Disclaimer- I can't draw for toffee. Personal not proffesional opinion.
Nice figure work, the right hand does seem to disappear into rather than hold the tanks. The tanks are a tad too oval and sadly what you intended to be a reflection of the clouds makes them seem a little see through. Speaking of light effects- why have glisten in the eyes and head hair but not elsewhere? A bit more might have been nice. The goggles are a bit asymetrical- keyhole shaped. The mouth piece has two ports- is this a fury adaption? The flow of the left tale gets a little angular towards the bottom.
Overall, though this is good work with what can be a very tricky program.