Fooocus + sd_xl_base_1.0_0.9vae.safetensors + Pixel Art XL (Lora).
Prompt is along the lines of "Pixel art, sprite sheet, 8x8, SUBJECT(TREES, OAK TREE, APPLE TREE)"
https://civitai.com/models/120096/pixel-art-xl
https://civitai.com be open minded, there's lot's of new possibilities using AI.