The guide
Lymiss wrote is very helpful but I wanted to add a few things in:
You can do this alongside the
Painter Extraordinaire aspiration to gain some reward points - this will let you buy perks and such such as instant refilling of your needs, or further perks such as
Savant which allows you to gain skills much quicker
You can also do this alongside the
Painter career which will increase all your money gain as you go.
To make this easier, and what I did, was used the
Digitalistic Sketchpad. You can buy this under the
Electronics tab in the store for
1,500 Simoleons. Pause your game, and fill your queue with paintings before speeding time up again. I found this worked much quicker than using the easel, as one set of queued paintings did about 1/4 of the skill bar at higher levels. I didn't use it at lower levels and began using it at level 8, but I imagine it will speed through the small level bars much quicker than using the easel.
Art your Sim makes on the sketchpad will be auto put into their inventory. You can sell it by dragging each painting to the easel and then selecting from there, or you can use the
Street Gallery item and sell your paintings on it for a mark up price in a similar way to car boot sales to make more than selling from the easel.
(Remember, there's also an achievement for gaining
1 million Simoleans in one singular household:
The Rosebud achievement in The Sims 4 worth 75 pointsGain 1,000,000 Simoleons in a single Household. )
Personally, I had one Sim working and another jobless Sim work on the skills to max them out, which ensured I had a good income coming in, but others have said playing the Aspiration and Career alongside this helped them max out as well if you are playing with a one Sim household, or also trying to get the painting career achievement: