Here's my step-by-step process for making a picture! :D
STEP 1 | STEP 2 | STEP 3 | STEP 4 | STEP 5

The program I use is Adobe Fireworks CS6, a now old and out-of-print software that was a competitor to Photoshop until Adobe bought it and eventually phased it out. It's somewhat dated, but it still works really well and they're doing some kind of sketchy stuff (no pun intended) with Photoshop these days :P

(Also too, I grabbed most of those images off of Google. I didn't bother to keep track of where they came from or who made them because I decided to make this "tutorial" after the fact. I don't even know if where I got them online was their original sources. So I don't know who made any of them, but if you do feel free to add it in the comments and, if you're one of the people who made one of them and doesn't want it here, PM me and I'm sure we can edit it out of the image or something) :D

I've also already done a video of me actually turning a sketch into a finished image, which you can find here :D

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Image tags: suggestive, artist:empressbridle, derpibooru import, anthro, unicorn, armor, axe, breasts, female, gradient background, guard, weapon

And, of course, the final images :D

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Image tags: explicit, alternate version, artist:sugarlesspaints, derpibooru import, twilight sparkle, twilight sparkle (alicorn), alicorn, anthro, zebra, g4, areola, balls, big penis, cock ring, condom, condom in mouth, cum, duo, female, filled condom, genital piercing, genitals, horsecock, huge penis, hyper, hyper penis, image, impossibly large penis, jpeg, male, mouth hold, nipple piercing, nipples, nudity, offscreen character, offscreen male, peace sign, penile piercing, penis, piercing, spread wings, straight, striped, vaginal piercing, vaginal secretions, vulva, wings

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Image tags: explicit, alternate version, artist:sugarlesspaints, derpibooru import, shining armor, twilight sparkle, twilight sparkle (alicorn), alicorn, anthro, unicorn, g4, areola, balls, big penis, blushing, breasts, brother and sister, female, genitals, horn, huge penis, hyper, hyper penis, image, impossibly large penis, incest, infidelity, jpeg, male, nipples, nudity, peace sign, penis, ship:shiningsparkle, shipping, siblings, straight, text, twicest