Artwork inspired by a Japanese game "Tabikaeru (旅かえる)" - a travelling frog game, the creator HITPOINT who also did "Neko Atsume (ねこあつめ)" - a cat collector game.
Credits of original work to HITPOINT :)
Original sketch was did by hand drawing and outline with artline pen.
After tracing with lines, filled out colors that was used in the game.
Added outlines and it's done!