step by step digital painting

Medical Illustration WIP: Bone Resorption by Osteoclasts

Please pardon my lack of posting in these past few weeks. Work temporarily took over! Let's get back to these step by steps shall we?


Below, I depict an osteoclast moving across the bone matrix and resorbing bone. Osteoclasts release digestive enzymes that break down the bone underneath.

I almost always start with a sketch which I eventually colorize to complement to overall color of the piece.

I almost always start with a sketch which I eventually colorize to complement to overall color of the piece.

Next, I use big brushes to start indicating form. I used the emboss feature and a textured brush to create the subtle, raised appearance in the surrounding matrix. 

New: Color and basic shadows. I added a subtle gradient to the background as well. 

New: Color and basic shadows. I added a subtle gradient to the background as well. 

Below I began adding highlighted regions. I also used a textured brush to create the look of chewed up/dissolved bone.

New: Increased texture in the furrow, highlights

New: Increased texture in the furrow, highlights

If you compare the image below to the one above it, you'll notice that the one below is much warmer. When turning my layers on and off to create these step-by-steps, I must have mistakenly turned off the adjustment layer that colorized the sketch!

Below, I have sharpened the highlights and made them just a little more pronounced. I also added detail to make the osteoclast fringes look more embedded in the matrix.

New: Sharpened highlights, detail along the Osteoclast (blue) fringes.

New: Sharpened highlights, detail along the Osteoclast (blue) fringes.

Below is the final illustration, with labels, as it appears in the poster. I added the text and arrow in Adobe InDesign.

figure_05e_fatunmbi.png

That's it for this week! Thanks for looking!

Medical Illustration Work in Progress: Figure 03 - Osteocytes

I discussed some of the process behind this sketch in an earlier post. I had just re-visited the concepts of light, shadow and form and it really influenced my rendering process. 

Sketch layer

Sketch layer

The image below goes a little beyond a flat fill and into some rendering. I almost never use black for my shadows. I usually start with a deep color like burgundy or navy.

If I want to check if I chose the right shadow color I'll apply a hue/saturation adjustment layer. From there, I will move the slider around the scale while glancing at the illustration. The right hue becomes obvious when I do this.

New: shadow on osteocyte and beneath processes, highlight on matrix, embossed texture on matrix

New: shadow on osteocyte and beneath processes, highlight on matrix, embossed texture on matrix

Here, I have begun adding highlights - my favorite part! I chose either a cool or a warm highlight color depending on which side of the osteocyte I was on. 

New: highlights on processes and cell body

New: highlights on processes and cell body

My next favorite part - reflective light. I selected colors from the surrounding matrix, and then lightened and increased their saturation. I glazed over the underside of the cell with my brush set to a very low flow in photoshop.

The final rendered osteocyte!

The final rendered osteocyte!

Below is the final image with text.

That's it! The making of an osteocyte! Come back again to see figure 4!

Feel free to visit my Wordpress blog to see more work!