A picture of the fish from above would help a lot, preferrably in a cointainer with white or light background so that it's easy to see the fish's outline. Females are generally more "fatty" than the males.
But the most telling feature of a male is "hairy" pectorals and back body, and I can't see any of that on your fish.
Moderator hat on: Could you please edit your profile to add your location - it helps us help you by giving correct advice for the place you're in [not really relevant for this question] - it's part of the Rules for the site too. Moderator hat off.
That's a better picture, and I'd up my percentage to 90% sure that it's a female based on this picture. It's difficult to be 100% sure, because it could be a male that isn't quite settled and/or not yet mature enough to show it's sexual signs - but I doubt it at 10cm in size. Caveat here would be that the fish is still stressed from the chain of transport to get to you tank. It can take several weeks of stabile conditions to make the fish show it's signs of sex, so if you just bought the fish, it may still be a "not-hairy" male.
Yes, your "living location" is just what we want. There are several quite active members from the Netherlands here on the forum.
