It's such an inexpensive panel, I almost hate to suggest this, but I would probably grab several different colors of thread -- either 100wt silk or 50/2 cotton -- that match or nearly match the colors in the print.
1. Tree trunks (Color A)
2. Stems (Colors A, B, C, H)
3. Yellow, orange, brown grass/fields (Colors C, D, E, F) - Dirt around base of flowers (G)
4. Sky (Colors A, G, H)
5. Houses (I)
6. Flower petals (Colors A, B, C, G, H)
7. Trees, bushes, green grass (B, C, E, F, H, I)
I would quilt my foundation lines first (marked in red, but quilted in the lightest color that matches that area).
[ATTACH=CONFIG]556149[/ATTACH]
Then, I would outline the tree trunks & stems of flowers. After that, I would fill in parallel lines in yellow to fill in the grassy areas between the foundation lines. I would go back & add a loopy line for areas where there is any green, brown or peach. I would add a pebble pattern in the pale green area by the base of the flowers. Next, I would quilt a cross hatch pattern using the 3 colors for the sky. Then, I would outline the houses & flower petals. I would probably just use the jet black thread to outline the villas, but D, E & F could work if you think those look better. When that was finished, I would mainly use that triple curved line design (not sure what it's called) to fill in the trees -- or you would leave them plain -- or even faux trapunto them, if you like. Here's what the triple curve looks like that I'm thinking of (I changed directions, so this is 4 repeats):
[ATTACH=CONFIG]556152[/ATTACH]
Hope that gives you some ideas. What a fun project! Can't wait to see what you do with it!