I do this for a living. You want to get a high dpi printer. HP makes good printers and they're pretty inexpensive. For highly detailed prints we us a epson stylus pro 11880, you also could run heavier canvas like materials if you don't want to print on solely paper. edit : just realized you're doing small a3 prints. Epson would be grand format printing. I do know printers but cant recommend a desktop printer, sorry.

Something is off and I think it’s in the transition shadow to light. My halftimes are too light maybe? The light source was from my phone’s flash slightly above but mostly behind the egg

I had fun and learned a lot making this piece. I can't wait for the next challenge.

Great portrait painting and I can't imagine how tough it was to paint. Jedidiah pointed some good feedback. I have some minor critique too. The first point is, your left eye (the eye in your shadow) looks not correct. It looks not 3dimensional. More like a simplify 2d eye. The second point is, your jaw in the shadow side have to move outside (but if your jaw look like that your had painted, then forget my point). The third point. The distance between your left eye and your ear is to large. You look a little bit to the left. My last minor point is your mouth. The perspective looked off. You need to turn your right side down.

Ooo! Excellent piece. The rendering on the face and hat is very well done. The atmosphere is good, the colours are very clean! The only problems I see are very minor things. For example, in this piece is how undefined the clothing looks at the bottom compared to the whole piece. It only slightly detracts from it though and it's not anything to worry about. The other thing I noticed is that the hat above is quite bright in the shadow area compared to the rest of the elements in the shadow. Unless that was done intentionally, or you were painting from a reference image, pushing the shadows a bit further would give the piece a bit more cohesion and the focal point (the face will pop out more). Some things I'd like to see (this is not a critique, just my recommendations) would be a bit more variety in the edges. You can try to lose the edge around the right shadow area of the hat to give it more interest. Maybe even in the areas of the face in the shadow As you can see only a few things changed nothing much!

when it comes to painting, the first thing you wanna consider is the light source. what color is it? is it the sun or studio light? is it hard or soft? this is mandatory in every realistic portrait paintings ever. in the original, Cesar Santos used a semi soft blue-ish ( or maybe white ) lightsource ( based on cool highlights on the forehead and the soft shadow ( the ambient lights is also quite cool ). your painting looks quite yellow overall, especially in the highlights. the overall pattern i'm seeing in the original painting is "cool light, warm shadow". his skin is also kinda dull in your painting, thats because you use very muddy gray for the shadow. but in cesar's artwork, he saturated the shadows, the color he used is a dark saturated orange. if you have photoshop or something, you can color pick both your painting and Cesar Santo's artwork to see the differences. if youre wondering how Cesar Santos's painting is so vibrant, that's because of "color notes". the colors are always shifting in hues, saturation slightly ( while the values stay mostly the same ). most prominent in the beard. you can see bright yellow, gray red, dark orange, dark red, dark gray purple, bright gray purple, even gray blue. but from far away, the beard seems gray. you can add a lot more variations in your painting, making it more interesting. ( if you dont what that is, here's Marco Bucci's video explaining it: https://www.youtube.com/watch?v=jFoKmX0LfCs ) the hairline should be softer. the proportions are slightly off, you can fix this by measuring, or if you have digital art software. put the original painting on top of yours and flip between them to find out your mistakes. notes: i mentioned about the "cool light, warm shadow" but you don't have to conform to it. you can see that some parts of the old man's beard ( in Cesar's painting ), he used warm orange, and for the brow bone highlights, he used bright orange. but the painting we can still tell that he used white / blue light source because Cesar used other factors, like how majority of the colors are in red in hue ( not in yellow like your painting ), other highlights are bluer, especially that forehead and the nose, and blue color notes. sorry if this critique is super confusing, i still have a lot to learn but i hope this critique was somewhat useful