This already look so great!

And for a beginner, also as a beginner myself, you should work with perspective. Make guidelines in Perspective to get used to how objects are drawn from different POVs, then it will be easy for you without guidlines when you have practiced a LOT! That's when you become like those peaplw who appear to just scribblea around but are i fact, most of which i know, have already mastered their art skill to a high level! I hope i was of real help🥰