Your digital works are your first coloured works, which can be seen. I am pretty curious about your usage of colour. Until now you were just playing around with your new tablet and ist okay. How long did you need to be able to draw like that? I know when I started with a tablet I had a lot of problems and it took me ages to get something on the digital paper, what could be recognized as that what it is.
In general you have clean lines in your studies as far as I see that and you aren't scared of shading. As far as I see this you are pretty hard working on your skill. So keep it on. I guess you will become better in no time.