Hi,
First of all i am welcoming your effort do scratchbuild a house on your own. The uprise of the Miniart buildings is probably disastrous for the hobby because the majority of the modelers will take the easy way and simply buy a house instead of scratchbuilding one.
That said a have a few recommandations and critics always considering that you are a beginner.
I simply start with the first picture.
As the house is set in the Ardennes i suppose that the roof is a slate shingle roof.
You should paint it a bit more gray instead of a near black. After the gray, you can take the wash you used for the front and wash all the roof and take it away with a rag. You can still do that, it will be worth it.
The tiles should be in one straight line. You can take one out, loose one or the other, but they stay in line because they are hold normaly with a nail. (that's for the next dio)
The stains under the windows arent good, sorry. Your wash was to thick. You must build that up with a few thinner washes until satisfied or alternatively apply a thick wash but immediately start to blot it away again until satisfied.
IMO, and always considdering it as a training for the next dio, repaint your whole front and redo the wheatering. If you have some dark pigments , those work also very good under the windows but also on the roof.
On the second photo, there is a bit to much moss on the cobble, a bit near the house would be enough if the street is well used.
Uhhh, the third picture!
My honnest advice here would be to salvage your furniture and destroy the house and restart. You don't want to :-)
What you can immediately do is take away those braces, (the two logs going up) and support with them the two rafters, so at least those are somewhat correct.
The rest of the roofwork is abit wron g to , but that would lead to far for now , but we can expand that later. For example, your planks are in the same direction as the support plank under it. You also don't have any support joists for your floors, the hang in the air.
You choose a very difficult first one with a lot of potential traps. Do you have access to your own attic at home. Go up and take a look at your roof..
Here are two pictures you can study.
The first is out of the book ModelBuilding Masterclass and describes the roof. The other is my own roof of the castle i made.


Do is see a support log in the bottom floor in the middle of the room? Take that away, it doesn't belong there.
Hope this helps. If you have more questions, please ask them.
Cheers
Claude