A mini-speculation on the SU: Gone Wrong page (congrats to Spud for having completed her move, by the way!).
The placement of the blood on Steven's eyes and mouth is eerily similar to the water we seen on Lapis in Chille Tid.
As a refresher, in Chille Tid, Steven came across the watery Lapis when he was in a dream; the image of Lapis like this, in torment in Malachite, inspired Steven to dream further and attack Malachite's mental foreground directly.
This could mean one or two things if I'm not being stupid and this wasn't just a creative choice. However, as the last speculation post gives away, Spud is very prone to leaving foreshadowing and symbolism in her art.
What could this blood placement mean?
What it most likely means is that Gem Steven may be "emotionally blocked", as Spud says, but he does have his own subconscious. In addition, he may still have retained his power of penetrating into Gem fusions via dreams. And even if this power hasn't been retained, he still may have the inspiration to do...something. What exactly? To try and comfort his dad? To try and acknowledge who he is?
Or is it to even try and fight Lapis?
Remember, he hasn't lain a single blow on her yet.
Oh, well. Just speculations. They may all be wrong.
(On another note, shout-out to the hand placement in the second to last panel.)