The great thing about this free tool is that you can choose from many options, including:

• Timer Interval: 30 seconds, 60 seconds, 2 minutes, 5 minutes, 10 minutes
• Take A Class: 30 minute trainer, 1 hour, 2 hours, 3 hours, 6 hours
  Classes warm you up with quick gesture drawings, then ease you into longer poses. They include built-in break times.
• Cover and Clothing: All models, Only nude models, Only “decent” models
• Include: Both genders, Only female models, Only male models

Alternatively, you can use the Animal Drawing Training Tool, which includes the same timing and “class” options as above, plus these:

Category:

• All Animals
• All Mammals
• Feline
• Canine
• Equine & Other hooves
• Birds
• Insects
• Reptiles & Amphibians
• Aquatic Animals
• Rodents
• All but insects

Skeletons: Include skeletons, Only show live animals