Now to think what game I'll be creating...
Pokemon maybe? Side-scrolling action? Must watch other's projects first for some inspiration.
(Will do more sprites for animation soon)
You could do a platformer. Maybe those three girls could be the characters, each with different abilities. Those images you got there could be the character select images.
Good artwork. You cannot officially do Pokemon (trademark reasons), but a monster collection game may be doable if you scrape off everything which identified it as Pokemon.