If I get 0,5 ml Juvederm, will it be visible? (Photo)

Thank you for sharing your question and photograph.  Unfortunately without an in-person discussion as to your goal results it is difficult to offer definite advice, but due to the lip tendency of swelling, I would recommend an initial 0.5cc treatment of your lips while then allowing your results 2 weeks time to mature.  If at that time you want additional volume, go back serially until you have achieved your desired outcome.  Hope this helps.

If you're looking to inject just the upper lip, as I would based on your picture, a 0.5cc amount is likely a great starting point. If planning to do the entire lips, then go for a full 1cc syringe. More importantly, have an expert who knows lip anatomy injecting you (e.g. dermatologist) for optimal results & fewest possible side effects and least downtime.

It depends on your expectations.  1 cc of filler is 1/5 of a teaspoon, so a fairly small volume.  You will see an increase in volume with 0.5 cc filler. If you are unsure I would get less and wait 2 weeks for swelling to fully go away and add more if you want more at that time.