Combine Down forms a new group, but still keeps each individual layer's specifications active. Merge Down makes two layers into one, for example, if you had Alpha Lock on to protect line boundaries in a layer, it will turn off. Simply tap a layer and you can select either Merge Down or Combine Down. To stay organized, or if you want an added level of security to a section of art, you can combine layers into groups. Procreate's layering feature makes it easy to edit different pieces of your project. Just tap the little "N" next to the checkmark that selects the layer. You can find extra light and color editing features for each layer as well. You'll just have to remember to put your work in piece by piece. It makes editing in the future much easier. I also love using the app's layering feature while I'm drawing. Read more: 15 Procreate app tips for budding iPad artists
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You can also find brushes made by other artists available for download through websites like Creative Market. Take it a step further by tapping the brush again and further customizing the properties of the tool. For example, if you choose Sketching, you can select from seven different pencils and three different pastel textures.
Under each category of brushes, you'll find a half a dozen or more choices. You can stick with basic sketching, inking, drawing and painting, or you can explore airbrushing, calligraphy, charcoal and spray paint.
The range of brushes available in the app fit just about any creation you could possibly have in mind. One of the biggest perks of Procreate is its massive library of 150 brushes. Swapping brushes on Procreate while creating a piece looks like this.