Burger girl on a train

A friend of mine wanted me to draw a girl he and his friends made up. I don't have many details, besides he want her to eat a burger on a train. So I did.

Critique and advice is very much appreciated. I'll continue to work to improve myself, but I can't without some proper criticism.

Side-note, I have a Patreon where I draw exclusive drawings. If that's something that appeals to you, or if you just like my art and wants to throw me a tip, feel free to do so: https://www.patreon.com/Poggnome