I find my biggest issue with these drawings is nothing to do with the drawings themselves, but the panelling. They don't seem to have "flow" to them - if that makes any sense. It kinda seems like the dragon is attacking but also isn't, and kinda just is confusing to read. This probably isn't aided by the lack of speech bubbles, but I assume those are a WIP. I just think you are making your audience's job difficult when they are reading this. I would suggest working on visual story telling first; make sure you can convey a story without having to rely on words or sounds.
Second issue: line weight. Since you aren't shading you really need to use the lineweight to your advantage, otherwise you cannot convey depth to your audience. You have nice outlines I notice, but I feel you could work a bit more on this area to really make it stand out.
Lastly, anatomy. My gripe is that it is quite simple, and there are some mistakes particularly around the arm area. I would make some studies on how the elbow joint works, for you have drawn them as if the bottom of the arm is facing towards us; despite that not making much sense given the pose. As for the simplicity, this can be effective in some scenarios. But I find that the detail you put into your monster/dragons and faces is not equally balanced out. Pretty cool though, keep at it
EDIT: Actually one more point; dynamics. These images seem to lack it, which is crippling when you are drawing action sequences. Best example being this here:
https://m.ak.fbcdn.net/photos-f.ak/hphotos-ak-ash3/s720x720/529499_10202354042482050_1845189686_n.jpg