A very nice drawing course and I like the finished result, too.
Noticing that you bought your pencil at Action, may I suggest their DecoTime color pencils to you? They come in 4 sets @ 18 colors, each set about 2.00 EUR for a full range. They're a real bargain, really soft and decently pigmented for the money. There is one red set that would have all the shades for this particular flower. As a bonus, they can be blended with water although they're not watercolor pencils.
The photo isn't that great but gives you an idea. Get them now - with Action, stuff is on sale today and gone tomorrow. These are not a regular stock item and it may be months until they come back.