This is the palette for pixilart.com;

 Hex code:  #390c14,#2a3636,#465544,#677a5d,#8a9c73,#babe85,#ebda8d,#fff4b0,#4d2c17,#71441c,#957128,#b8993d,#d8bf63,#bc9e24,#e8c128,#ffdd3d,#5f521a,#817b1a,#a4a51e,#d5c529,#83391d,#b65f21,#db9421,#ffbc30,#d68533,#ebaa46,#facb67,#ffe58c,#ac4427,#d96624,#fc8e26,#c64e2c,#ef6544,#e06d34,#f4893d,#fba74e,#fcba62 

 If you know how to import palettes, skip the tutorial below.

You go to pixilart.com/draw This will show up, 

They will give a tutorial if you are not signed in, 

If you want to use Pixilart but can't find this palette in the palette library, 

You don't pick a palette,

Click on the + button next to the palette name in the preview tab,
After that, 

a pop-up will appear(make sure to enable pop-ups) and enter the name of the palette(Autumn Harvest 37),

 Click OK, 

Then, click this button,

Another pop-up will appear asking you to enter your colours in HEX separated by commas, 

Inside that paste the whole slew of HEX data I gave you earlier with the commas, Click OK. 

Now with your palette uploaded, you are pretty much free to draw anything with the palette.