Coll art! I like it very much! Your sence of style is awesome! Here is one little thing that seems strange to me - if it wouldn't be a title, I could never guess that here are giants. And the reason is - they have thin legs. I can be wrong, but I think that giants should have mighty legs to move their mighty weight. It will make them look much stronger. Sorry for this advice from mewbie, I hope it is OK
Very cool, i like all their different expressions as well as their anatomy, it's all pretty spot on. The one thing i would suggest tho is maybe adding some more environment below them to really help push their feeling of scale. You're a killer environment painter, so i wouldn't suggest this to the typical character artist, but maybe further utilize that environment knowledge and add some farmhouses below them with nearby fields, or some cattle, or a road with a wagon passing in front of their feet. The image as a whole is solid as is, but those things might make a great piece even better.