i did a fast redraw. firstly, i am a beginner so i dont know if these tips n stuff are correct. and i also want to point out that your tent looks great, i just peaked stuff here and there. what i did was
- tried to shade the cloth a more naturly way (i did it one side but you get the idea) i find this a bit of style choice.
your tent have a bit of pillow shading, and i though it would look better to draw the shape of the cloth.
- i made one side darker, wich indicate that the sun is shining from the right side
- i made your thick lines smaller, it looks really bulky with that strong lines.
- redid the tent opening (only one side so you get the idea)
- made theoutlines a bit softer
- made smal shades from the smal pillar/tree stuff
i hope it helps somwhat