Can someone rate my First Interior Design please..?

Can someone rate my First Interior Design please…? Out of 5 star how many star would you give to this design…? Project was a 12 feet by 12 feet Office Room Design With Boss Table, Work Station and Poster / Wall Design. I have a feelings that I need to improve a lot. For your information, I had only few days of online training about 3d design in SketchUp. Also I realized that my PC configuration for 3d design is weak. Suggest me anything for improving my 3d design. Thanks.

Regards
SajibJewel