The kanji 画 is introduced in level 6, but the first vocabulary items using it (画像, 映画) are only in level 13. This strikes me as rather odd – surely, this could be moved to around that level, or a single-kanji vocabulary entry (e.g. かく) added to level 6 or 7? (Or 画家 be added, as 家 is in level 7, although that word is apparently not extremely common?) I understand that the kanji is rather simple so can be introduced early, but there doesn’t seem to be a reason to burden the beginner levels with kanji that go unused for quite some time.
I certainly find that I remember kanji more easily if I also learn associated vocabulary (perhaps just because they come up more often in reviews, then).
I don’t have an official answer, but there are a lot of visually similar boxy looking kanji on that level and the previous one, so it may be to help the recognition discrimination early on. Plus the construction is fairly simple
画; 両; 毎; 雨; 南; 曲; 直
Strangely, 画 doesn’t keep the leaf stem on WK Community, so your mileage on visual similarity may vary.