I will painting my wall in leasure time
Wall painting is a great way to spend free time. Ensure you are using a primer to make it last!
Yes.  I like mostly painting in my wall
Do you like to paint it one color? or do you paint a mural? What is your inspiration?
I don't have any inspirations.  Just that is my hobby
Hobby lobby has lots of inspiration ideas for wall painting. Hobby lobby also caries paint supplies which is nice!
My favorite wall painting is tree painting.
It would be cool to do a birch forest mural. I saw one on HGTV once. It made me feel like I was in the forest. 
Yes. I always like the forest.
It seems complex to do a lot of trees. It may be easier to just paint one big tree. I heard of the painted forest fine arts festival. Maybe that could give you some inspiration for your wall painting. If the weather is nice it is on october 5th!