Hi Kristian,
I think this is not bad at all, if you are new at arch viz... I think you saw yourself what points you can make better. My opinion is that the overall look of the images is a bit "flat", and don't help much the building... Usually those images are made to present a project, so you must help the project to look at his best... For example, in the first image you have trees masking almost all the building, so one could ask "what is that image for?", and in the second one, it looks like a bit sad building, with no light inside... I would try to put some more life in there... Light, brighter reflexions, more contrast, people, etc...
Hope it helps!