Nice!

There's definitely a recognizable likeness there. But when I look closely, the features and even the forms themselves are vaguely indicated and a bit sloppy. It seems the expressiveness of the bold brushstrokes overwhelmed any attempt at indicating three dimensional forms. And that's okay. It can be a style choice to work that way. But if it were me, I would focus more on explaining the forms and planes of the face through careful application of the paint. Be more aware of your edge quality. And most of all - the actual drawing. For example, make sure the eyes are "his" eyes. And not just general symbols for eyes.

Nice job, Nikolaos. I consider this a successful caricature. The exaggeration is on point and it shows a lot of likeness and personality. So take what I'm about to say as a personal opinion, because I don't know where you want to take your art. I feel it lacks a bit of structure. The original photo has a very bright light in the side of his face that you didn't include in your final drawing. It would help a lot the value arrangement as it would give it more contrast, and also it would show where the face turn helping it show the 3-d form. His right eye higher is bothering me. From what I can see, he closes more his left eye but, still, both eyes are in the same level. The dark shadow in the corner of his mouth feels out of place without the bright side light also. Value arrangement is easier to change. Structure...well that's the problem. If you want to have more close representations use the Reilly abstractions to align the features. If you want to do caricatures that also distort the skull I would advise to exaggerate it more. Make it more intentional, study and experiment how moving a feature up or down impact the rest of the face. But, again, The hardest part of caricature, exaggeration and likeness, you're doing it well. You just need a few tweaks here and there to find your voice. So keep drawing, keep studying and keep experimenting. Best Regards.