Created a static image of a penguin on an iceberg

I was struggling how to draw an oval for my penguin. I needed to look
up videos/read up how to do it. I also had to look up how to set the size of the image.
I found it really difficult to just start the penguin, but once I got the shapes
I felt more comfortable.

shapes.py

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+import turtle
+from math import cos, sin, pi, radians
+
+def move_to(x, y):
+    t.penup(); t.goto(x, y); t.pendown()
+
+def filled_rect(x1, y1, x2, y2, fill, outline="black"):
+    t.pencolor(outline)
+    t.fillcolor(fill)
+    move_to(x1, y1)
+    t.begin_fill()
+    t.goto(x2, y1)
+    t.goto(x2, y2)
+    t.goto(x1, y2)
+    t.goto(x1, y1)
+    t.end_fill()
+
+def draw_oval(cx, cy, rx, ry, tilt=0, fill=None, steps=180):
+    """Parametric ellipse; steps controls smoothness."""
+    ang = radians(tilt)
+    def R(x, y):  # rotate (x,y) by tilt
+        return (x*cos(ang) - y*sin(ang), x*sin(ang) + y*cos(ang))
+
+    t.fillcolor(fill if fill else "")
+    move_to(cx + rx, cy)  # start at angle 0
+    if fill:
+        t.begin_fill()
+    for i in range(1, steps + 1):
+        theta = 2*pi*i/steps
+        x, y = rx*cos(theta), ry*sin(theta)
+        xr, yr = R(x, y)
+        t.goto(cx + xr, cy + yr)
+    if fill:
+        t.end_fill()
+
+def poly(points, fill=None):
+    if fill: t.fillcolor(fill); t.begin_fill()
+    move_to(*points[0])
+    for p in points[1:]:
+        t.goto(*p)
+    t.goto(*points[0])
+    if fill: t.end_fill()
+
+def right_triangle(ax, ay, leg1, leg2, angle=0, fill=None):
+    """Right angle at (ax, ay). leg1 along 'angle' degrees, leg2 perpendicular."""
+    a = radians(angle)
+    B = (ax + leg1*cos(a), ay + leg1*sin(a))            # along angle
+    C = (ax - leg2*sin(a), ay + leg2*cos(a))            # 90° to the left
+    poly([(ax, ay), B, C], fill=fill)