Both sides look good to me. Now will you dare to do another?
How about adding a bit of graffiti first.
Using a rattle can to get the desired results isn’t easy. Tips I have found out through practice is to not start on the model but you want to make a pass by starting the spray off the model then continuing over it and don’t stop spraying until you are off again. You can also experiment with distance of the can to your model which will give you different effects but keep the can moving. Don’t start and stop the spray while you are on the model or it can lead to splatters.
I use easily removable foam coal loads in my hoppers and they often run empty so dusting the inside with flat/satin black works well for me. I give the floor a good blast and the sides get a dusting of the over spray.
Keep experimenting. I have used boxes for practice before moving to the model.
Happy RRing