Er...Somehow I have a slight suspicion that those are stolen. Guess the aura of noobishness and the fairly good art don't match. But hey, innocent until proven guilty.
Some lineart is needed...Colours just sort of running together with no border never look that good itn my opinion. But maybe that's just your style.
The shading on the first is very basic and mediocre, you should try blending the colours more.
The second one has almost no shading, which makes it look unrealistic and flat.
Overall, they aren't terrible, but you should definitely get in some more practice.
EDIT: On closer inspection, they don't look stolen, but traced. Looks like you just got some ****** lineart, coloured it, then took off the lineart. Which is okay, I guess, but you should say in your first post if that's the case.
On the other hand, if this really is 100% original art, then I apologise for jumping to conclusions.