It's fun, but not so much when you know you can get higher results by cheesing a dumb strategy than by actually trying to draw. Improving scoring could really help... (others already made good suggestions).

Drawing something that complex in such a short amount of time is quite a challenge, keeping within a minute is strictly in party game realm. I used to do ultra low-res versions of paintings (in Pico-8) and the shortest I could do for things like this would be 10 minutes I think (upwards to 20).

For reference, the Mona Lisa: https://woolion.art/assets/img/wobblepaint/017(joconde).gif