@Oana looks like you're off to a great start! Have fun with it!
Advice or tips? Start out using high-quality materials instead of "student grade" -- I learned this the hard way. It looks like you have the Winsor and Newton professional line of watercolors, so you're way ahead of me when I started out! If you continue in watercolor, I recommend trying out a few different brands of paint to find the paints that match your preferences and your style.
I also learned that the paper and brushes you use make a BIG difference! 100% cotton watercolor paper behaves SO much differently than wood pulp or cellulose paper -- if you're an artist who likes to work in layers (and it appears you do) 100% cotton paper works with you instead of fighting the cellulose paper, which tends to not absorb the paint so the layer(s) below lift when you're trying to put down a new layer.
If you like YouTube and want to learn more about watercolor supplies and techniques, I highly recommend In Liquid Color and The Mind of Watercolor -- both are highly informative channels.