Wohey, nice use of colour here. Kinda jealous. Your colouring and shading skills seem pretty dang sharp, in my opinion. The (slightly) weaker points seem to be in your anatomy. For instance your giant's arm looks kinda.. ginormous, in a way that looks a bit wrong. It's possible you were trying to put perspective in it, but that didn't really get through.
Like I said, your feel and skill with colouring looks great, and your pieces as a whole do too, but a minor thought maybe: both these pieces seem to have a small figure being dwarfed by a much larger one, but both pictures are framed very frontally. You might want to try out some extremes in perspective (frog-perspective for instance) which will immediatly make your images a lot more intense and dynamic, if done correctly.
But still, great.